SMEDS Space Utilization — Pilot Analysis

SMEDS Middle School Space Utilization — Pilot Analysis

St. Mary’s Episcopal Day School | Middle School Division

Report Date: March 28, 2026

Prepared by: Mai Nguyen

Academic Year: Semester 1, Quarter 1, AY 2025–26

Reviewer: Andrew Taylor

Analytic Scope This report covers the St. Mary’s Episcopal Day School Middle School division only (Grades 6–8). Data reflects Semester 1, Quarter 1, Academic Year 2025–2026. Schedule analysis is limited to Periods 2–5 (core academic sections). Period 1 electives, homeroom, and non-academic blocks are excluded from all metrics. Specialist rooms shared with lower divisions are reported separately in Section 7.

Metric Reference Legend

ATUAvg Time Utilization ASOAvg Seat Occupancy CSUICombined Space Utilization Index RERRoom Exclusivity Rate CBICapacity Buffer Index SERSpace Elasticity Ratio PDRPeak Demand Ratio PSMIQualitative — see §6.8 SSDNot computed — school-wide data unavailable IDIExcluded — redundant with ASO at SMEDS

2. School-Wide Summary

Aggregated metrics for the MS division as a whole: one number per metric across all in-scope rooms. See Key Findings (Section 3) for interpretation.

50.0%

ATU

Avg Time Utilization — MS-exclusive rooms

72.9%

ASO

Avg Seat Occupancy — MS-exclusive rooms

31.3%

CSUI

Avg Combined Index — all MS rooms

53.3%

RER

Room Exclusivity Rate — MS division

ATU averages 50% across MS-exclusive rooms; roughly half of available P2–P5 time is unscheduled. When sessions run, rooms fill to 72.9% on average, within the 60–75% target band.

⚠ Note — Period 1 excluded from both numerator and denominator. The ATU denominator is 23.33 hrs/wk = 4 in-scope periods (P2–P5) × 70 min × 5 days. Period 1 (Tuesday/Thursday electives for grades 7–8; homeroom/advisory for grade 6) is excluded from the schedule grid and from the denominator. ATU reflects P2–P5 core academic scheduling only. For rooms with confirmed P1 elective use (208, 213, 214, 218, 220, 221), adding Period 1 would shift both numerator and denominator, but the net effect on ATU is indeterminate: P1 session frequency was not in the schedule data.

3. Key Findings

Time utilization. MS rooms average 50% ATU, meaning roughly half of available P2–P5 time is unscheduled. Whether the unused half represents genuine scheduling headroom depends on factors outside this dataset: full faculty load, non-teaching duties, and multi-division coordination.
Seat occupancy. When sessions do run, MS rooms fill to 73% on average, within the 60–75% target band, but the distribution is wide. The Boardroom and Room 218 approach or exceed rated capacity at peak; Rooms 219 and 210 run consistently small classes relative to room size. These opposite problems call for different questions: Is the Boardroom’s high occupancy driven by enrollment alone, or do its features attract scheduling preference? Room 219 runs Latin exclusively (Grades 6–8, Gold section); small enrollment is structural for an elective language course. Room 210 runs core math sections (6th grade and Pre-Algebra, Gold track); whether small enrollment reflects section-level ability-grouping or a broader program decision is a question for the school.
Space elasticity. The methodology document (updated 2026-02-23, covering 9 metrics) defines SER as the percentage of rooms that can accommodate ±30% enrollment variation without overcrowding or underfilling. At SMEDS, none of the 15 rooms in scope meet that threshold. The overcrowding condition is self-contained: 130% of the highest enrollment observed in the Q1 window must not exceed rated capacity. The underfilling condition requires a floor: 70% of the lowest observed enrollment must still clear some minimum occupancy threshold — but no threshold is specified for SER, so I inferred 50% of capacity from the ASO benchmark. That assumption has not been confirmed. The 3×3 labels in §6.4 sidestep this by using the school’s own quartile distribution rather than an unconfirmed absolute floor.
Scheduling distribution. MS scheduling is evenly distributed across Periods 2–5 on both A and B days (PDR ≈ 1.1). No period concentrates demand. The ATU shortfall is a scheduling frequency problem, not a period distribution problem: the gap is in how often rooms are scheduled, not in which period carries the load.
Scheduling control. Of the 15 MS rooms in scope, 8 are MS-exclusive and 7 are shared with Grade 5 or other divisions. Scheduling changes to the shared rooms require cross-division coordination; the MS division’s independent leverage is limited to the 8 exclusive rooms.

If Q1 scheduling reflects SMEDS’s typical pattern (and if scheduling decisions for the 8 MS-exclusive rooms sit within the MS division), these rooms average roughly 25 percentage points below the ATU target: scheduled half the time when three-quarters is the goal. The rooms are there; the gap is in how often they are scheduled. That reframes the capacity question: not whether SMEDS has enough rooms, but whether the current faculty load and section structure are using what the MS division already holds.

Open items for Andrew’s review before finalising

CBI: Algebraically redundant with ASO (CBI = 100 − ASO). Retain or remove? If removed, the CBI column in §4 and §6 will be dropped.
IDI: Redundant with ASO at SMEDS. Retain any density metric in the final report?
Notes §8: Please confirm whether any data limitation materially affects the analytical conclusions in §6 before this report is shared with Kristen.

4. Room Scorecard — Periods 2–5, Q1 2025–26

One row per room — all metrics at a glance. Schedule coverage map in Section 5; per-metric detail in Section 6.

Table 1: Room scorecard — all metrics, Periods 2–5, Q1 2025–26. [S] = shared room.
Room	Type	Ownership	ATU %	Sched hrs/wk	ASO %	Enroll (wtd avg)	Capacity	CSUI %	CBI %†	SER	CSUI Band
208	Science Lab	exclusive	50.0%	11.7	69.0%	20.0	29	34.5%	31.0%	Moderate	Median–75th pctile
210	Classroom	exclusive	56.3%	13.1	42.9%	12.0	28	24.2%	57.1%	Underutilized	25th pctile–Median
212	Classroom	exclusive	50.0%	11.7	80.0%	24.0	30	40.0%	20.0%	Well utilized	Top 25%
213	Classroom	exclusive	25.0%	5.8	80.0%	24.0	30	20.0%	20.0%	Well utilized	Bottom 25%
214	Classroom	exclusive	50.0%	11.7	66.7%	20.0	30	33.4%	33.3%	Moderate	Median–75th pctile
220	Classroom	exclusive	56.3%	13.1	62.5%	15.0	24	35.2%	37.5%	Volatile	Median–75th pctile
221	Classroom	exclusive	50.0%	11.7	83.3%	20.0	24	41.6%	16.7%	Well utilized	Top 25%
Boardroom	Classroom	exclusive	62.5%	14.6	98.9%	18.8	19	61.8%	1.1%	Under pressure	Top 25%
209 [S]	Classroom	shared_w_Gr5	39.2%	8.8	58.6%	17.0	29	23.0%	41.4%	Chronically sparse	Bottom 25%
211 [S]	Classroom	shared_w_Gr5	42.9%	8.8	58.9%	17.7	30	25.3%	41.1%	Moderate	25th pctile–Median
218 [S]	Classroom	shared_w_Gr5	33.3%	5.8	92.3%	24.0	26	30.7%	7.7%	At/over capacity	Median–75th pctile
219 [S]	Classroom	shared_w_Gr5	42.9%	8.8	27.8%	6.7	24	11.9%	72.2%	Chronically sparse	Bottom 25%
Art Room [S]	Specialist	shared_w_school	50.0%	11.7	83.7%	21.8	26	41.9%	16.3%	Under pressure	Top 25%
Music Room [S]	Specialist	shared_w_school	25.0%	5.8	68.3%	20.5	30	17.1%	31.7%	Moderate	Bottom 25%
Religious Studies room [S]	Specialist	shared_w_school	43.8%	10.2	66.9%	16.7	25	29.3%	33.1%	Moderate	25th pctile–Median

[S] Rooms shared with Grade 5 or other divisions carry ATU/ASO caveats: metrics reflect MS Periods 2–5 usage only. See Section 8.

SER result reflects the ±30% elasticity test on the 2-week Q1 enrollment range. See Note 8.7.

† CBI = 100 − ASO (algebraically redundant with ASO). Retention pending Andrew’s confirmation (see Section 6.8).

5. Schedule Map

Room × period × day-type occupancy across the 2-week Q1 grid.

Column notation: Each period is split into two 35-min blocks: P2i = Period 2 first half (08:50–09:25) · P2ii = Period 2 second half (09:25–10:00), and so on for P3–P5. A 70-min class spans both halves and appears as a merged cell. A 35-min class occupies one half only.

Seat occupancy % (enrollment ÷ room capacity):

0% 25% 50% 75% 100% >100% Vacant

A-Day (canonical Monday)

Room	P2i	P2ii	P3i	P3ii	P4i	P4ii	P5i	P5ii
	08:50-09:25	09:25-10:00	10:30-11:05	11:05-11:40	11:45-12:20	12:20-12:55	13:45-14:20	14:20-14:55
208 MS-only · Science Lab 1,176 sqft · 29 seats	65.5% (19/29) 208 · Period 2 · A-day 7 LifeSci (Blue) Breit Enrollment: 19 / 29 seats · Occupancy: 65.5%		69.0% (20/29) 208 · Period 3 · A-day 7 LifeSci (Gold) Breit Enrollment: 20 / 29 seats · Occupancy: 69.0%		— 208 · Period 4 · A-day Vacant	— 208 · Period 4 · A-day Vacant	— 208 · Period 5 · A-day Vacant	— 208 · Period 5 · A-day Vacant
210 MS-only · Classroom 840 sqft · 28 seats	21.4% (6/28) 210 · Period 2 · A-day 6 Math6 (Blue) Grieves Enrollment: 6 / 28 seats · Occupancy: 21.4%	71.4% (20/28) 210 · Period 2 · A-day 6 Math6 (Gold) Grieves Enrollment: 20 / 28 seats · Occupancy: 71.4%	— 210 · Period 3 · A-day Vacant	— 210 · Period 3 · A-day Vacant	35.7% (10/28) 210 · Period 4 · A-day 7 PreAlg (Gold) Grieves Enrollment: 10 / 28 seats · Occupancy: 35.7%		— 210 · Period 5 · A-day Vacant	— 210 · Period 5 · A-day Vacant
212 MS-only · Classroom 900 sqft · 30 seats	— 212 · Period 2 · A-day Vacant	— 212 · Period 2 · A-day Vacant	— 212 · Period 3 · A-day Vacant	— 212 · Period 3 · A-day Vacant	80.0% (24/30) 212 · Period 4 · A-day 6 LangArts (Blue) Cárdenas Enrollment: 24 / 30 seats · Occupancy: 80.0%		80.0% (24/30) 212 · Period 5 · A-day 6 LangArts (Gold) Cárdenas Enrollment: 24 / 30 seats · Occupancy: 80.0%
213 MS-only · Classroom 900 sqft · 30 seats	— 213 · Period 2 · A-day Vacant	— 213 · Period 2 · A-day Vacant	— 213 · Period 3 · A-day Vacant	— 213 · Period 3 · A-day Vacant	80.0% (24/30) 213 · Period 4 · A-day 6 GlobStud (Gold) Boza Enrollment: 24 / 30 seats · Occupancy: 80.0%		80.0% (24/30) 213 · Period 5 · A-day 6 GlobStud (Blue) Boza Enrollment: 24 / 30 seats · Occupancy: 80.0%
214 MS-only · Classroom 900 sqft · 30 seats	66.7% (20/30) 214 · Period 2 · A-day 8 USHist (Blue) Bauer Enrollment: 20 / 30 seats · Occupancy: 66.7%		— 214 · Period 3 · A-day Vacant	— 214 · Period 3 · A-day Vacant	— 214 · Period 4 · A-day Vacant	— 214 · Period 4 · A-day Vacant	70.0% (21/30) 214 · Period 5 · A-day 8 USHist (Gold) Bauer Enrollment: 21 / 30 seats · Occupancy: 70.0%
220 MS-only · Classroom 736 sqft · 24 seats	91.7% (22/24) 220 · Period 2 · A-day 6 PreAlg (Blue) Cummins Enrollment: 22 / 24 seats · Occupancy: 91.7%	— 220 · Period 2 · A-day Vacant	58.3% (14/24) 220 · Period 3 · A-day 8 Alg1H (Blue) Cummins Enrollment: 14 / 24 seats · Occupancy: 58.3%		37.5% (9/24) 220 · Period 4 · A-day 7 PreAlg (Blue) Cummins Enrollment: 9 / 24 seats · Occupancy: 37.5%		— 220 · Period 5 · A-day Vacant	— 220 · Period 5 · A-day Vacant
221 MS-only · Classroom 736 sqft · 24 seats	— 221 · Period 2 · A-day Vacant	— 221 · Period 2 · A-day Vacant	79.2% (19/24) 221 · Period 3 · A-day 7 LangArt70 (Blue) Henson Enrollment: 19 / 24 seats · Occupancy: 79.2%		— 221 · Period 4 · A-day Vacant	— 221 · Period 4 · A-day Vacant	83.3% (20/24) 221 · Period 5 · A-day 7 LangArt70 (Gold) Henson Enrollment: 20 / 24 seats · Occupancy: 83.3%
Boardroom MS-only · Classroom 580 sqft · 19 seats	110.5% (21/19) Boardroom · Period 2 · A-day 8 WritResS1 (Gold) Delgado Enrollment: 21 / 19 seats · Occupancy: 110.5%		110.5% (21/19) Boardroom · Period 3 · A-day 6 Span (Gold) Miño Enrollment: 21 / 19 seats · Occupancy: 110.5%		89.5% (17/19) Boardroom · Period 4 · A-day 8 Span (Gold) Miño Enrollment: 17 / 19 seats · Occupancy: 89.5%		105.3% (20/19) Boardroom · Period 5 · A-day 8 WritResS1 (Blue) Delgado Enrollment: 20 / 19 seats · Occupancy: 105.3%
209 Shared w/ Gr5 · Classroom 884 sqft · 29 seats	— 209 · Period 2 · A-day Vacant	— 209 · Period 2 · A-day Vacant	48.3% (14/29) 209 · Period 3 · A-day 8 Alg1H (Gold) Mendes Enrollment: 14 / 29 seats · Occupancy: 48.3%		69.0% (20/29) 209 · Period 4 · A-day 7 Alg1H (Blue) Mendes Enrollment: 20 / 29 seats · Occupancy: 69.0%		— 209 · Period 5 · A-day Vacant	— 209 · Period 5 · A-day Vacant
211 Shared w/ Gr5 · Classroom 900 sqft · 30 seats	— 211 · Period 2 · A-day Vacant	— 211 · Period 2 · A-day Vacant	70.0% (21/30) 211 · Period 3 · A-day 6 Span (Blue) Cosentino Enrollment: 21 / 30 seats · Occupancy: 70.0%		56.7% (17/30) 211 · Period 4 · A-day 8 Span (Blue) Cosentino Enrollment: 17 / 30 seats · Occupancy: 56.7%		— 211 · Period 5 · A-day Vacant	— 211 · Period 5 · A-day Vacant
218 Shared w/ Gr5 · Classroom 800 sqft · 26 seats	— 218 · Period 2 · A-day Vacant	— 218 · Period 2 · A-day Vacant	— 218 · Period 3 · A-day Vacant	— 218 · Period 3 · A-day Vacant	— 218 · Period 4 · A-day Vacant	— 218 · Period 4 · A-day Vacant	— 218 · Period 5 · A-day Vacant	— 218 · Period 5 · A-day Vacant
219 Shared w/ Gr5 · Classroom 736 sqft · 24 seats	— 219 · Period 2 · A-day Vacant	— 219 · Period 2 · A-day Vacant	25.0% (6/24) 219 · Period 3 · A-day 6 Latin (Gold) Sowerby Enrollment: 6 / 24 seats · Occupancy: 25.0%		29.2% (7/24) 219 · Period 4 · A-day 8 Latin (Gold) Sowerby Enrollment: 7 / 24 seats · Occupancy: 29.2%		— 219 · Period 5 · A-day Vacant	— 219 · Period 5 · A-day Vacant
Art Room Shared w/ School · Specialist 1,170 sqft · 26 seats	76.9% (20/26) Art Room · Period 2 · A-day 7 ArtS1 (Gold) Kenney Enrollment: 20 / 26 seats · Occupancy: 76.9%		— Art Room · Period 3 · A-day Vacant	— Art Room · Period 3 · A-day Vacant	— Art Room · Period 4 · A-day Vacant	— Art Room · Period 4 · A-day Vacant	73.1% (19/26) Art Room · Period 5 · A-day 7 ArtS1 (Blue) Kenney Enrollment: 19 / 26 seats · Occupancy: 73.1%
Music Room Shared w/ School · Specialist 1,365 sqft · 30 seats	— Music Room · Period 2 · A-day Vacant	— Music Room · Period 2 · A-day Vacant	— Music Room · Period 3 · A-day Vacant	— Music Room · Period 3 · A-day Vacant	— Music Room · Period 4 · A-day Vacant	— Music Room · Period 4 · A-day Vacant	— Music Room · Period 5 · A-day Vacant	— Music Room · Period 5 · A-day Vacant
Religious Studies room Shared w/ School · Specialist 756 sqft · 25 seats	— Religious Studies room · Period 2 · A-day Vacant	— Religious Studies room · Period 2 · A-day Vacant	52.0% (13/25) Religious Studies room · Period 3 · A-day 8 Geom (Blue) McLaughlin Enrollment: 13 / 25 seats · Occupancy: 52.0%		— Religious Studies room · Period 4 · A-day Vacant	— Religious Studies room · Period 4 · A-day Vacant	— Religious Studies room · Period 5 · A-day Vacant	— Religious Studies room · Period 5 · A-day Vacant

B-Day (canonical Tuesday)

Room	P2i	P2ii	P3i	P3ii	P4i	P4ii	P5i	P5ii
	08:50-09:25	09:25-10:00	10:30-11:05	11:05-11:40	11:45-12:20	12:20-12:55	13:45-14:20	14:20-14:55
208 MS-only · Science Lab 1,176 sqft · 29 seats	69.0% (20/29) 208 · Period 2 · B-day 8 PhysSciH (Blue) Sowerby Enrollment: 20 / 29 seats · Occupancy: 69.0%		— 208 · Period 3 · B-day Vacant	— 208 · Period 3 · B-day Vacant	72.4% (21/29) 208 · Period 4 · B-day 8 PhysSciH (Gold) Sowerby Enrollment: 21 / 29 seats · Occupancy: 72.4%		— 208 · Period 5 · B-day Vacant	— 208 · Period 5 · B-day Vacant
210 MS-only · Classroom 840 sqft · 28 seats	21.4% (6/28) 210 · Period 2 · B-day 6 Math6 (Blue) Grieves Enrollment: 6 / 28 seats · Occupancy: 21.4%		— 210 · Period 3 · B-day Vacant	— 210 · Period 3 · B-day Vacant	35.7% (10/28) 210 · Period 4 · B-day 7 PreAlg (Gold) Grieves Enrollment: 10 / 28 seats · Occupancy: 35.7%	— 210 · Period 4 · B-day Vacant	71.4% (20/28) 210 · Period 5 · B-day 6 Math6 (Gold) Grieves Enrollment: 20 / 28 seats · Occupancy: 71.4%
212 MS-only · Classroom 900 sqft · 30 seats	— 212 · Period 2 · B-day Vacant	— 212 · Period 2 · B-day Vacant	80.0% (24/30) 212 · Period 3 · B-day 6 LangArts (Gold) Cárdenas Enrollment: 24 / 30 seats · Occupancy: 80.0%		80.0% (24/30) 212 · Period 4 · B-day 6 LangArts (Blue) Cárdenas Enrollment: 24 / 30 seats · Occupancy: 80.0%		— 212 · Period 5 · B-day Vacant	— 212 · Period 5 · B-day Vacant
213 MS-only · Classroom 900 sqft · 30 seats	— 213 · Period 2 · B-day Vacant	— 213 · Period 2 · B-day Vacant	— 213 · Period 3 · B-day Vacant	— 213 · Period 3 · B-day Vacant	— 213 · Period 4 · B-day Vacant	— 213 · Period 4 · B-day Vacant	— 213 · Period 5 · B-day Vacant	— 213 · Period 5 · B-day Vacant
214 MS-only · Classroom 900 sqft · 30 seats	66.7% (20/30) 214 · Period 2 · B-day 7 USHist (Gold) Bauer Enrollment: 20 / 30 seats · Occupancy: 66.7%		— 214 · Period 3 · B-day Vacant	— 214 · Period 3 · B-day Vacant	— 214 · Period 4 · B-day Vacant	— 214 · Period 4 · B-day Vacant	63.3% (19/30) 214 · Period 5 · B-day 7 USHist (Blue) Bauer Enrollment: 19 / 30 seats · Occupancy: 63.3%
220 MS-only · Classroom 736 sqft · 24 seats	91.7% (22/24) 220 · Period 2 · B-day 6 PreAlg (Blue) Cummins Enrollment: 22 / 24 seats · Occupancy: 91.7%		— 220 · Period 3 · B-day Vacant	58.3% (14/24) 220 · Period 3 · B-day 8 Alg1H (Blue) Cummins Enrollment: 14 / 24 seats · Occupancy: 58.3%	37.5% (9/24) 220 · Period 4 · B-day 7 PreAlg (Blue) Cummins Enrollment: 9 / 24 seats · Occupancy: 37.5%	— 220 · Period 4 · B-day Vacant	— 220 · Period 5 · B-day Vacant	— 220 · Period 5 · B-day Vacant
221 MS-only · Classroom 736 sqft · 24 seats	— 221 · Period 2 · B-day Vacant	— 221 · Period 2 · B-day Vacant	— 221 · Period 3 · B-day Vacant	— 221 · Period 3 · B-day Vacant	83.3% (20/24) 221 · Period 4 · B-day 8 LangArt70 (Blue) Henson Enrollment: 20 / 24 seats · Occupancy: 83.3%		87.5% (21/24) 221 · Period 5 · B-day 8 LangArt70 (Gold) Henson Enrollment: 21 / 24 seats · Occupancy: 87.5%
Boardroom MS-only · Classroom 580 sqft · 19 seats	— Boardroom · Period 2 · B-day Vacant	— Boardroom · Period 2 · B-day Vacant	78.9% (15/19) Boardroom · Period 3 · B-day 7 Span (Gold) Delgado Enrollment: 15 / 19 seats · Occupancy: 78.9%		— Boardroom · Period 4 · B-day Vacant	— Boardroom · Period 4 · B-day Vacant	— Boardroom · Period 5 · B-day Vacant	— Boardroom · Period 5 · B-day Vacant
209 Shared w/ Gr5 · Classroom 884 sqft · 29 seats	— 209 · Period 2 · B-day Vacant	— 209 · Period 2 · B-day Vacant	— 209 · Period 3 · B-day Vacant	48.3% (14/29) 209 · Period 3 · B-day 8 Alg1H (Gold) Mendes Enrollment: 14 / 29 seats · Occupancy: 48.3%	69.0% (20/29) 209 · Period 4 · B-day 7 Alg1H (Blue) Mendes Enrollment: 20 / 29 seats · Occupancy: 69.0%	— 209 · Period 4 · B-day Vacant	— 209 · Period 5 · B-day Vacant	— 209 · Period 5 · B-day Vacant
211 Shared w/ Gr5 · Classroom 900 sqft · 30 seats	— 211 · Period 2 · B-day Vacant	— 211 · Period 2 · B-day Vacant	50.0% (15/30) 211 · Period 3 · B-day 7 Span (Blue) Cosentino Enrollment: 15 / 30 seats · Occupancy: 50.0%		— 211 · Period 4 · B-day Vacant	— 211 · Period 4 · B-day Vacant	— 211 · Period 5 · B-day Vacant	— 211 · Period 5 · B-day Vacant
218 Shared w/ Gr5 · Classroom 800 sqft · 26 seats	— 218 · Period 2 · B-day Vacant	— 218 · Period 2 · B-day Vacant	92.3% (24/26) 218 · Period 3 · B-day 6 EarthSci (Blue) Tuohy Enrollment: 24 / 26 seats · Occupancy: 92.3%		92.3% (24/26) 218 · Period 4 · B-day 6 EarthSci (Gold) Tuohy Enrollment: 24 / 26 seats · Occupancy: 92.3%		— 218 · Period 5 · B-day Vacant	— 218 · Period 5 · B-day Vacant
219 Shared w/ Gr5 · Classroom 736 sqft · 24 seats	— 219 · Period 2 · B-day Vacant	— 219 · Period 2 · B-day Vacant	29.2% (7/24) 219 · Period 3 · B-day 7 Latin (Gold) Sowerby Enrollment: 7 / 24 seats · Occupancy: 29.2%		— 219 · Period 4 · B-day Vacant	— 219 · Period 4 · B-day Vacant	— 219 · Period 5 · B-day Vacant	— 219 · Period 5 · B-day Vacant
Art Room Shared w/ School · Specialist 1,170 sqft · 26 seats	76.9% (20/26) Art Room · Period 2 · B-day 6 EnrArtQ1 (Gold) Kenney Enrollment: 20 / 26 seats · Occupancy: 76.9%		— Art Room · Period 3 · B-day Vacant	— Art Room · Period 3 · B-day Vacant	— Art Room · Period 4 · B-day Vacant	— Art Room · Period 4 · B-day Vacant	107.7% (28/26) Art Room · Period 5 · B-day 6 EnrArtQ1 (Blue) Kenney Enrollment: 28 / 26 seats · Occupancy: 107.7%
Music Room Shared w/ School · Specialist 1,365 sqft · 30 seats	70.0% (21/30) Music Room · Period 2 · B-day 8 EnrPerfQ1 (Gold) Delgado/Craig Enrollment: 21 / 30 seats · Occupancy: 70.0%		— Music Room · Period 3 · B-day Vacant	— Music Room · Period 3 · B-day Vacant	— Music Room · Period 4 · B-day Vacant	— Music Room · Period 4 · B-day Vacant	66.7% (20/30) Music Room · Period 5 · B-day 8 EnrPerfQ1 (Blue) Delgado/Craig Enrollment: 20 / 30 seats · Occupancy: 66.7%
Religious Studies room Shared w/ School · Specialist 756 sqft · 25 seats	76.0% (19/25) Religious Studies room · Period 2 · B-day 7 EnrReligQ1 (Blue) McLaughlin Enrollment: 19 / 25 seats · Occupancy: 76.0%		— Religious Studies room · Period 3 · B-day Vacant	52.0% (13/25) Religious Studies room · Period 3 · B-day 8 Geom (Blue) McLaughlin Enrollment: 13 / 25 seats · Occupancy: 52.0%	— Religious Studies room · Period 4 · B-day Vacant	— Religious Studies room · Period 4 · B-day Vacant	80.0% (20/25) Religious Studies room · Period 5 · B-day 7 EnrReligQ1 (Gold) McLaughlin Enrollment: 20 / 25 seats · Occupancy: 80.0%

Hover any cell for room · period · grade/course/section · teacher · enrollment/capacity · occupancy %.

6. Metric Analysis

Metrics computed for this pilot:

Metric	Question it answers	Formula / notes
ATU — Average Time Utilization	How often is this room scheduled?	Scheduled hrs ÷ available hrs, Periods 2–5
ASO — Average Seat Occupancy	When sessions run, how full is the room?	Duration-weighted enrollment ÷ room capacity
CSUI — Combined Space Utilization Index	How productively is this room used overall?	ATU × ASO composite
CBI — Capacity Buffer Index	How much capacity buffer exists above average enrollment?	100 − ASO (provisional — see Open Items, §3)
SER — Space Elasticity Ratio	Does this room’s enrollment range fit its capacity?	Enrollment range vs. capacity; quartile-based labels
RER — Room Exclusivity Rate	How much of the MS footprint does the division control directly?	Exclusive rooms ÷ total MS rooms
PDR — Peak Demand Ratio	Is scheduling load evenly spread across periods, or concentrated at peak?	Peak-period sessions ÷ mean sessions per period

Full metric definitions, non-computed metrics, and data pipeline details are in the technical provenance document.

6.1 ATU — Average Time Utilization

ATU = hrs_wk_scheduled ÷ hrs_wk_available × 100
Denominator baseline: 23.33 hrs/wk (P2–P5 × 70 min × 5 days). Grade 5 sharing reductions applied per room: Room 209 −1 hr/wk; Room 218 −5.833 hrs/wk (Hill’s A-day schedule); Rooms 219 and 211 −2.917 hrs/wk.
Benchmark: ≥75% Optimised | 60–74% Healthy | 30–59% Review | <30% Action needed
School distribution: (N=15): 25th pctile = 41.0% | Median = 50.0% | 75th pctile = 50.0% | SD = 10.9%.
The In-School Distribution column shows each room’s rank within this school only — not against an external benchmark. ‘Top 25%’ means the room scores above the 75th percentile of MS rooms; ‘Bottom 25%’ means it falls below the 25th percentile.

Table 2: ATU by room — scheduled vs. available hours, Periods 2–5, Q1 2025–26.
Room	Type	Ownership	Sched hrs/wk	Avail hrs/wk	ATU %	Benchmark	In-School Distribution
Boardroom	Classroom	exclusive	14.58	23.33	62.5	Healthy (60–74%)	Top 25%
210	Classroom	exclusive	13.12	23.33	56.3	Review (30–59%)	Top 25%
220	Classroom	exclusive	13.12	23.33	56.3	Review (30–59%)	Top 25%
208	Science Lab	exclusive	11.67	23.33	50.0	Review (30–59%)	Median–75th pctile
212	Classroom	exclusive	11.67	23.33	50.0	Review (30–59%)	Median–75th pctile
214	Classroom	exclusive	11.67	23.33	50.0	Review (30–59%)	Median–75th pctile
221	Classroom	exclusive	11.67	23.33	50.0	Review (30–59%)	Median–75th pctile
Art Room	Specialist	shared_w_school	11.67	23.33	50.0	Review (30–59%)	Median–75th pctile
Religious Studies room	Specialist	shared_w_school	10.21	23.33	43.8	Review (30–59%)	25th pctile–Median
211	Classroom	shared_w_Gr5	8.75	20.41	42.9	Review (30–59%)	25th pctile–Median
219	Classroom	shared_w_Gr5	8.75	20.41	42.9	Review (30–59%)	25th pctile–Median
209	Classroom	shared_w_Gr5	8.75	22.33	39.2	Review (30–59%)	Bottom 25%
218	Classroom	shared_w_Gr5	5.83	17.50	33.3	Review (30–59%)	Bottom 25%
213	Classroom	exclusive	5.83	23.33	25.0	Action needed (<30%)	Bottom 25%
Music Room	Specialist	shared_w_school	5.83	23.33	25.0	Action needed (<30%)	Bottom 25%

No room reaches the ≥75% ATU target. The Boardroom is the only room above the 60% floor, at 62.5%. All others fall below 60%; Room 213 and Music Room are the lowest at 25%. The MS-exclusive average is 50%. Four periods (P2–P5) set the ceiling: 280 min of potential scheduling time per day, but most rooms host fewer than 4 sections. Grade 5 shared rooms show similarly low ATU; their denominators are adjusted downward but scheduling frequency remains low.

Note: the median equals Q3 (both 50.0%) because five rooms share an identical scheduled load of 11.67 hrs/wk, collapsing the upper-middle of the distribution. The SD of 10.9% reflects spread at the tails (two rooms at 25% ATU and one at 62.5%) rather than genuine variance across the majority of rooms.

⚠ Note 6.1 — ATU denominator excludes Period 1; Grade 5 deductions for Rooms 218, 219, 211 are inferred. Denominator = 23.33 hrs/wk (Periods 2–5 only). Room 218 denominator reduced by 5.833 hrs/wk (inferred from specialist schedules; Q1 period confirmed). Rooms 219 and 211 each reduced by 2.917 hrs/wk (inferred from school records, applied to Q1).

6.2 ASO — Average Seat Occupancy

ASO = (Duration-Weighted Average Enrollment ÷ Room Capacity) × 100
Enrollment weighted by section duration (minutes): a 70-min session counts twice as much as a 35-min session, reflecting actual seat-time consumed rather than a simple average across sessions. For example, a room hosting 25 students for 70 min and 10 students for 35 min has a weighted average of (25×70 + 10×35) ÷ (70+35) = 20 students (closer to the longer session). Capacity from confirmed room inventory (sqft ÷ 30 for classrooms; sqft ÷ 40 for Science Lab Room 208).
Benchmark: 60–75% target | <50% oversized | >85% crowded
School distribution: (N=15): 25th pctile = 60.7% | Median = 68.3% | 75th pctile = 81.7% | SD = 18.4%.
The In-School Distribution column shows each room’s rank within this school only — not against an external benchmark. ‘Top 25%’ means the room scores above the 75th percentile of MS rooms; ‘Bottom 25%’ means it falls below the 25th percentile.

Table 3: ASO by room — duration-weighted enrollment vs. capacity, Q1 2025–26.
Room	Type	Capacity	Enroll (wtd avg)	ASO %	Benchmark	In-School Distribution
Boardroom	Classroom	19	18.80	98.9	Full (≥75%)	Top 25%
218	Classroom	26	24.00	92.3	Full (≥75%)	Top 25%
Art Room	Specialist	26	21.75	83.7	Full (≥75%)	Top 25%
221	Classroom	24	20.00	83.3	Full (≥75%)	Top 25%
212	Classroom	30	24.00	80.0	Full (≥75%)	Median–75th pctile
213	Classroom	30	24.00	80.0	Full (≥75%)	Median–75th pctile
208	Science Lab	29	20.00	69.0	Moderate (50–74%)	Median–75th pctile
Music Room	Specialist	30	20.50	68.3	Moderate (50–74%)	Median–75th pctile
Religious Studies room	Specialist	25	16.71	66.9	Moderate (50–74%)	25th pctile–Median
214	Classroom	30	20.00	66.7	Moderate (50–74%)	25th pctile–Median
220	Classroom	24	15.00	62.5	Moderate (50–74%)	25th pctile–Median
211	Classroom	30	17.67	58.9	Moderate (50–74%)	Bottom 25%
209	Classroom	29	17.00	58.6	Moderate (50–74%)	Bottom 25%
210	Classroom	28	12.00	42.9	Low (25–49%)	Bottom 25%
219	Classroom	24	6.67	27.8	Low (25–49%)	Bottom 25%

The ASO distribution splits the MS portfolio into two opposite groups: rooms consistently filled to or past rated capacity, and rooms running small classes relative to room size. The MS-exclusive average of 72.9% sits within the 60–75% target band but conceals both extremes. The Boardroom (98.9% ASO) and Room 218 (92.3%) are both in the crowding zone, but they are not equivalent: Room 218 approaches its rated ceiling; the Boardroom exceeds it. Peak MS enrollment reaches 21 students against a rated capacity of 19. That distinction matters because the Boardroom’s constraint is physical: its 580 sqft footprint caps capacity at 19 seats (30 sqft/student regulatory standard), and no scheduling change raises that ceiling. At the other extreme, Room 219 (27.8%) and Room 210 (42.9%) are structurally low-occupancy: classes assigned to these rooms are small relative to room size.

6.3 CSUI — Combined Space Utilization Index

CSUI = ATU (decimal) × ASO (decimal)
Composite productivity indicator combining time and seat utilization.
Benchmark: >0.50 (50%) strong | 0.30–0.50 moderate | <0.30 weak
School distribution: (N=15): 25th pctile = 23.6% | Median = 30.7% | 75th pctile = 37.6% | SD = 12.3%.
The In-School Distribution column shows each room’s rank within this school only — not against an external benchmark. ‘Top 25%’ means the room scores above the 75th percentile of MS rooms; ‘Bottom 25%’ means it falls below the 25th percentile.

ATU caps CSUI for most rooms: with the majority below 50% time utilization, the ATU × ASO product rarely clears the 50% threshold even at high seat fill. The Boardroom is the exception: near-capacity enrollment pushes its CSUI to 61.8% despite moderate scheduling frequency.

Table 4: CSUI by room — ATU × ASO composite, with projected CSUI at 75% ATU target.
Room	ATU %	ASO %	CSUI %	CSUI @ 75% ATU	Benchmark	In-School Distribution
Boardroom	62.5	98.9	61.8	74.2	Strong	Top 25%
Art Room	50.0	83.7	41.9	62.8	Moderate	Top 25%
221	50.0	83.3	41.6	62.5	Moderate	Top 25%
212	50.0	80.0	40.0	60.0	Moderate	Top 25%
220	56.3	62.5	35.2	46.9	Moderate	Median–75th pctile
208	50.0	69.0	34.5	51.7	Moderate	Median–75th pctile
214	50.0	66.7	33.4	50.0	Moderate	Median–75th pctile
218	33.3	92.3	30.7	69.2	Moderate	Median–75th pctile
Religious Studies room	43.8	66.9	29.3	50.2	Weak	25th pctile–Median
211	42.9	58.9	25.3	44.2	Weak	25th pctile–Median
210	56.3	42.9	24.2	32.2	Weak	25th pctile–Median
209	39.2	58.6	23.0	44.0	Weak	Bottom 25%
213	25.0	80.0	20.0	60.0	Weak	Bottom 25%
Music Room	25.0	68.3	17.1	51.2	Weak	Bottom 25%
219	42.9	27.8	11.9	20.9	Weak	Bottom 25%

The MS division average CSUI of 31.3% sits at the lower end of the 30–50% range. Only the Boardroom clears the 50% threshold (61.8%). The CSUI @ 75% ATU column is a mechanical benchmark scenario: it holds ASO constant and shows where each room would land if scheduling frequency alone reached the ATU target.

6.4 SER — Space Elasticity Ratio

SER 3×3 label: rooms classified by floor band (Min occ%) × peak band (Peak occ%), each split at Q1 and Q3 of the school’s own distribution. Labels: Chronically sparse | Underutilized | Volatile | Sparse peak | Moderate | Under pressure | Well utilized | At/over capacity.
Min occ% = enroll_min / Room_Capacity × 100 (occupancy at lowest observed enrollment) — (N=15): 25th pctile = 49.1% | Median = 65.5% | 75th pctile = 79.1% | SD = 21.3%.
Peak occ% = enroll_max / Room_Capacity × 100 (occupancy at highest observed enrollment) — (N=15): 25th pctile = 70.0% | Median = 80.0% | 75th pctile = 89.6% | SD = 19.2%.
Headroom% = (Room_Capacity − enroll_max) / Room_Capacity × 100 (slack at peak; negative = over capacity)
Occ range% = Peak occ% − Min occ%
Column colors for Min occ% and Peak occ% show each room’s rank within this school: green = top 25%, yellow = middle, red = bottom 25%.

SER dot plot. Each horizontal line captures a room's enrollment range: minimum occupancy rate (open dot) to peak occupancy rate (filled dot). Orange dashed line = Q1 of floor occ% (low floor threshold); green dashed line = Q3 of peak occ% (high peak threshold).

Figure 1: SER dot plot. Each horizontal line captures a room’s enrollment range: minimum occupancy rate (open dot) to peak occupancy rate (filled dot). Orange dashed line = Q1 of floor occ% (low floor threshold); green dashed line = Q3 of peak occ% (high peak threshold).

Table 5: SER by room: enrollment range, headroom, and 3×3 label. **Floor bands** (Min occ%): low <49.1% | mid 49.1–79.1% | high >79.1%. **Peak bands** (Peak occ%): low <70.0% | mid 70.0–89.6% | high >89.6%. Sorted by headroom (tightest first).
		Combined (A+B)				A-Day		B-Day
Room	Capacity	Min occ%	Peak occ%	Occ range (pp)	Headroom%	N sec	Peak%	N sec	Peak%	Label
Boardroom	19	78.9	110.5	31.6	-10.5	4	110.5	1	78.9	Under pressure (mid floor, high peak)
Art Room	26	73.1	107.7	34.6	-7.7	2	76.9	2	107.7	Under pressure (mid floor, high peak)
218	26	92.3	92.3	0.0	7.7	—	—	2	92.3	At/over capacity (high floor, high peak)
220	24	37.5	91.7	54.2	8.3	3	91.7	3	91.7	Volatile (low floor, high peak)
221	24	79.2	87.5	8.3	12.5	2	83.3	2	87.5	Well utilized (high floor, mid peak)
212	30	80.0	80.0	0.0	20.0	2	80	2	80	Well utilized (high floor, mid peak)
213	30	80.0	80.0	0.0	20.0	2	80	—	—	Well utilized (high floor, mid peak)
Religious Studies room	25	52.0	80.0	28.0	20.0	1	52	3	80	Moderate (mid floor, mid peak)
208	29	65.5	72.4	6.9	27.6	2	69	2	72.4	Moderate (mid floor, mid peak)
210	28	21.4	71.4	50.0	28.6	3	71.4	3	71.4	Underutilized (low floor, mid peak)
214	30	63.3	70.0	6.7	30.0	2	70	2	66.7	Moderate (mid floor, mid peak)
211	30	50.0	70.0	20.0	30.0	2	70	1	50	Moderate (mid floor, mid peak)
Music Room	30	66.7	70.0	3.3	30.0	—	—	2	70	Moderate (mid floor, mid peak)
209	29	48.3	69.0	20.7	31.0	2	69	2	69	Chronically sparse (low floor, low peak)
219	24	25.0	29.2	4.2	70.8	2	29.2	1	29.2	Chronically sparse (low floor, low peak)

Four enrollment patterns emerge:

Boardroom and Art Room are labeled Under pressure (mid floor, high peak) and carry negative headroom: enrollment exceeds rated capacity at peak (-10.5% and -7.7% respectively). Room 218 is labeled At/over capacity by the school-relative framework, ranking highest on both floor and peak occupancy within this school, though headroom stays positive at 7.7%.
Room 220 is the only room labeled Volatile: peak reaches 91.7% on some sessions and falls to 37.5% on others, a 54-point swing.
Rooms 219 and 209 are labeled Chronically sparse: both floor and peak fall in the bottom quartile of the school’s distribution. Room 219 is the more extreme case; even its peak session (29.2%) barely clears 30%. Room 210 is labeled Underutilized.
The remaining eight rooms divide into two groups: five (208, 211, 214, Music Room, Religious Studies) are labeled Moderate, with occupancy in the middle band on both floor and peak; three (212, 213, 221) are labeled Well utilized, with floor occupancy in the top quartile. All eight carry positive headroom.

⚠ Note 6.4 — SER based on 2-week enrollment range only. enroll_min and enroll_max reflect variation observed within the Q1 2-week schedule grid, not year-over-year enrollment swings. See Note 8.7.

6.5 PDR — Peak Demand Ratio

PDR = blocks at peak period ÷ mean blocks per period (by day type)
Counting unit: 35-min blocks (the smallest schedulable unit at SMEDS). A 70-min session = 2 blocks; a 35-min half-period = 1 block. Computed on the canonical A-day and B-day (Week 1) only. Gym excluded; Grade 5 sessions in shared rooms excluded.

PDR result — no scheduling concentration A-day PDR: 1.16 | B-day PDR: 1.12
Both A-day and B-day values are close to 1.0, indicating even distribution of sessions across Periods 2–5. No single period carries a disproportionate share of MS room use. The ATU shortfall is a scheduling frequency problem, not a within-day distribution problem.

6.6 RER — Room Exclusivity Rate

RER = n_exclusive ÷ n_total_ms_rooms × 100
Grouping unit: MS division. MS-only rooms count toward the exclusive numerator; Grade 5 cross-division rooms and whole-school specialist rooms (Art, Music, Religious Studies) are included in the denominator but not the numerator. See Section 6.8 for the Strings classroom note.
Answers: what fraction of the rooms MS uses are under exclusive MS scheduling control?

Table 6: RER — room count by ownership category.
Ownership	N rooms	% of MS rooms	Note
exclusive	8	53.3	MS-only — full metrics apply
shared_w_Gr5	4	26.7	Grade 5 cross-division — ATU denominator adjusted
shared_w_school	3	20.0	Whole-school specialist — MS metrics are partial

RER = 53.3% (8 exclusive / 15 total MS rooms)

At 53%, MS has exclusive scheduling control over 8 of 15 rooms in its footprint. The remaining 7 carry attribution caveats: 4 are shared with Grade 5 with documented hour deductions; 3 are whole-school specialist rooms (Art Room, Music Room, Religious Studies) with no divisional hour allocation available. No published benchmark for RER exists. The 53% rate reflects the typical K–8 pattern of shared specialist facilities; it marks the extent of cross-division coordination required, not a performance gap. Metric accuracy for those 7 rooms is also lower: no complete cross-division schedule was available, so the figures reflect data gaps as much as actual sharing patterns.

6.7 Cross-Metric Analysis

Three patterns stand out across the four metrics:

Boardroom is the most heavily used room in the MS portfolio, scheduled 62.5% of available time and running at 98.9% occupancy when in session. It is the only room already past its rated capacity at peak (headroom -10.5%).
Rooms 213 and Music Room tell the opposite story. Both are scheduled only 25% of the time, but when sessions run they fill to 80% and 68.3% respectively. The gap is scheduling frequency, not class size.
Room 219 is the exception on both dimensions: moderate scheduling (42.9% ATU) but very low occupancy when in use (27.8% ASO), giving it the lowest CSUI in the portfolio.

The cross-tabs below assign each room to a quadrant and show which rooms MS can act on independently.

Cross-metric heatmap — ATU, ASO, and CSUI each scale from pale (weakest in SMEDS) to dark green (strongest); Headroom uses a diverging scale: red for over capacity, white at break-even, dark green for positive headroom. Rooms sorted top-to-bottom by CSUI.

Figure 2: Cross-metric heatmap — ATU, ASO, and CSUI each scale from pale (weakest in SMEDS) to dark green (strongest); Headroom uses a diverging scale: red for over capacity, white at break-even, dark green for positive headroom. Rooms sorted top-to-bottom by CSUI.

No room reaches the ATU ≥75% target; the entire portfolio sits in the Low ATU half of the grid.

ATU × ASO

The table below places each room in an ATU × ASO quadrant. ASO splits at 60% (target band floor); ATU splits at 60% (Healthy benchmark floor).

	Seat Occupancy (ASO)
ATU	ASO ≥60%	ASO <60%
High ATU (≥60%)	Boardroom	—
Low ATU (<60%)	218, Art Room, 221, 212, 213, 208, Music Room, Religious Studies room, 214, 220	211, 209, 210, 219

SER label × ATU

SER label	High ATU (≥60%)	Low ATU (<60%)
Under pressure	Boardroom	Art Room
At/over capacity	—	218
Volatile	—	220
Well utilized	—	212, 213, 221
Moderate	—	208, 211, 214, Music Room, Religious Studies room
Underutilized	—	210
Chronically sparse	—	209, 219

Low ATU + Under pressure is the key disambiguation cell: Room 218 appears crowded at peak but is rarely scheduled; the constraint is scheduling frequency, not physical capacity. The Boardroom is the only High ATU + Under pressure room: a genuine physical constraint that no scheduling change resolves.

SER label × Ownership

SER label	Exclusive (MS-only)	Shared w/ School	Shared w/ Gr5
Under pressure	Boardroom	Art Room	—
At/over capacity	—	—	218
Volatile	220	—	—
Well utilized	212, 213, 221	—	—
Moderate	208, 214	Music Room, Religious Studies room	211
Underutilized	210	—	—
Chronically sparse	—	—	209, 219

Ownership determines actionability: exclusive rooms with non-Moderate SER labels are under full MS scheduling control; shared rooms require cross-division coordination before any change is possible.

6.8 Metrics Considered but Excluded or Deferred

PSMI — Program–Space Match Index

The schedule data offers a partial read on program-space fit: specialist rooms are used by the teachers whose disciplines they are built for (Art Room → art; Music Room → performing arts; Religious Studies room → theology). A formal PSMI score cannot be computed from the MS-only schedule grid: it would exclude individual student sessions and Lower School classes that also use these rooms, and those gaps would structurally bias any index derived from MS data alone.

The data confirms that no specialist room is being repurposed for non-specialist instruction, which is the core concern PSMI is designed to flag. That finding holds.

Strings classroom note: The Strings room is excluded from the room inventory: no Grade 6–8 instructional sessions appear during Periods 2–5. If Strings sessions were included, the room would rank among the highest ATU in the building.

CBI — Capacity Buffer Index (provisional). CBI = 100 − ASO, making it algebraically redundant with ASO. The headroom% column in the SER table (Section 6.4) conveys the same capacity-slack information with a signed framing (negative = over capacity). See Open Items in §3.

SSD — School Schedule Density (not computed). Requires a complete room inventory across all divisions. Only the MS P2–P5 schedule is available from SMEDS.

IDI — Instructional Density Index (excluded). At SMEDS, IDI is algebraically redundant with ASO (capacity derived from sqft ÷ SREF standard). Not an established industry metric with universal benchmarks. If a code-compliance check is needed, implement as a boolean: actual sqft/student ≥ SREF minimum.

See Open Items in §3.

7. Shared Specialist Rooms: Cross-Division Usage Context

Art Room, Music Room, and Religious Studies room are shared across divisions; no formal MS-only hour allocation exists, so their ATU and ASO reflect MS P2–P5 use only. Instructional hours from teacher schedule data give a cross-division picture: confirmed sessions span grades 3–8 for Art, grades 4–8 for Religious Studies, and grades 5–8 for Music. Cross-division implied ATU reaches 69.4% for the Art Room and 50.2% for Music and Religious Studies, confirming these rooms are meaningfully occupied beyond MS. MS-only figures substantially understate their actual occupancy.

Table 7: Specialist rooms: MS-only metrics vs. cross-division implied ATU from teacher schedule data.
Metric	Art Room	Music Room	Religious Studies room
MS sched hrs/wk	11.7	5.8	10.2
ATU % (MS only)	50.0%	25.0%	43.8%
ASO % (MS only)	83.7%	68.3%	66.9%
Cross-div instr hrs/wk (P2–5)	16.2	11.7	11.7
Implied ATU % (cross-div)	69.4%	50.2%	50.2%

⚠ Note 7.1 — Specialist room columns reflect two different data sources. MS ATU and ASO are derived from the MS P2–P5 schedule. The “Specialist instr hrs/wk” and “Implied ATU” columns are derived from specialist teacher schedules covering all grade divisions. Short elective sessions at day-start were excluded to keep the denominator consistent with the MS ATU window. Methodology details are in the technical provenance document.

8. Data Notes

Note 8.1 — Enrollment data reflects the Q1 2025-26 SIS snapshot Enrollment figures reflect the Q1 SIS export (January 21, 2026). For ongoing monitoring, refresh the SIS export at each quarter end.

Note 8.2 — Period 1 excluded from all metrics by design Period 1 is excluded from all metrics by design. The ATU denominator (23.33 hrs/wk) covers Periods 2–5 only; this boundary is consistent across all rooms.

Note 8.3 — Rooms 209, 211, 218, 219: Grade 5 sharing reduces available time Four rooms share time with Grade 5. ATU denominators are adjusted downward for each; the adjustments range from 1 to 5.8 hrs/wk depending on the room. Methodology details are in the technical provenance document.

Note 8.5 — Boardroom is over capacity at peak; division allocation unresolved The Boardroom has a confirmed rated capacity of 19 seats. At peak MS enrollment, occupancy reaches 21 students, exceeding rated capacity (headroom -10.5%). The capacity constraint is structural: at 580 sqft, the regulatory standard (30 sqft/student) yields a fixed 19-seat ceiling. The room is also used by the Lower School division daily; no confirmed MS/LS time allocation exists. ASO figures for the Boardroom reflect MS schedule sessions only and do not account for Lower School use.

Note 8.6 — Room Exclusivity Rate counts MS-only rooms as exclusive Specialist rooms shared with other divisions are included in the denominator but not the numerator. See §6.8 for the Strings classroom note.

Note 8.7 — SER label is school-relative (quartile-based); binary ±30% threshold deferred The SER label in Section 4 and Section 6.4 uses this school’s own quartile distribution: rooms at or below the 25th percentile of min occ% are labelled Underutilized; rooms at or above the 75th percentile of peak occ% are labelled Under pressure. Labels describe position within SMEDS’s own distribution, not benchmarks against other schools. The binary ±30% pass/fail threshold is deferred pending Andrew’s review. enroll_min/max reflect the Q1 2-week schedule grid only, not year-over-year enrollment swings.

Because this pilot covers 15 rooms, the ‘Under pressure’ and ‘Underutilized’ labels identify the handful of rooms at the most extreme ends of SMEDS’s own range. With only 3–4 rooms per quartile boundary, a single room reclassification shifts the cutoff. Treat them as directional signals, not exact grades.

SMEDS Space Utilization — Pilot Analysis | SpaceLogic Analytics | Generated 2026-03-28