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Session 4 · Compare

Time Machine

Drag through eight weeks of construction. Compare weeks side by side, overlay them, or let the change map highlight what moved. Then record observations — with evidence — for your report.

Week 1Week 6: Roof / exteriorWeek 8
Comparing against week 4
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Week 4: Slab complete, Level 1 steel up, tower crane on site, steel staged west, new annex pad east of the building. → Week 6: Metal roof deck on, south and west walls complete, east wall started, parking base graded. (Summaries are ground truth for the demo only — in the field you won’t have them.)

Click the map to observe
Pick a spot where something changed. Record what you SEE first — interpretation comes second, and must be labelled as such.
Observations (0)
Build report →
    Challenge: What changed? Week 03 → Week 04Challenge: What changed? Week 06 → Week 07
    Warm-up

    Observation or interpretation?

    An observation is what the data shows. An interpretation is what you think it means. Reports need both — clearly separated.

    • “Asphalt covers the west half of the parking area in week 7; the east half is still gravel.”

    • “The roof deck will be finished next week.”

    • “The steel crew is ahead of schedule.”

    • “They must have used the stockpile for backfill.”

    • “The drainage design is bad.”

    • “The stockpile in grid G-1 is visibly smaller than in week 3.”

    • “Steel columns are visible across the full footprint in week 6; none were visible in week 4.”

    • “Standing water is visible in the southwest corner of the excavation.”