Target: infer a possible network effect from a spatial relationship, then identify the data needed before proposing a real route. Prepare: Card C and grid reader.
- Launch · 2 min. In the scenario B2 bridge is closed; ask whether a clinic at lower-labelled C2 is necessarily reachable from the west.
- Model · 4 min. Place library C1, clinic C2, workshop D2, interchange B3. B2 is the only supplied crossing. A western traveller's access may fail even if C2 is lower model inundation. Never tell a learner to use an unverified route.
- Guided reading · 5 min. Ask what a current road authority map, accessibility information, timing and emergency direction would add. Separate facility exposure from network access.
- Practice route · 7 min. Choose Day 8 route. Draw or describe the network dependency and a cautious school/clinic/transport communication action, conditional on authority verification.
- Audit · 4 min. Partner invents an eastern crossing; learner points out none is given and holds the route claim.
- Exit · 3 min. “What does the B2 closure establish?” Key: the only supplied west-to-east crossing is closed in this invented scenario; a real safe route cannot be concluded.