Daily Learning Contract
- Topic: Bridge Design Evidence
- Objective: Students will compare bridge systems, create two options, and select a design from evidence.
- TEKS: d(1)(C)
- Demonstration of Learning: Two-view options + critique + individual career-role decision.
Lesson Overview
| Time | 50 minutes |
| Target | Compare bridge systems, create two options, and select a design from evidence. |
| TEKS | d(1)(C) |
| Evidence | Two-view options + critique + individual career-role decision |
Before Class
Provide one Canvas-capable device or one four-page landscape design packet per student, plus pencil and ruler. Students use one route. Work is individual; pairs may give the brief critique, with self-review or a teacher conference as equal routes. Project packet page 1 and the supplied two-option model in the Teacher Guide. No physical materials or build station are required.
50-Minute Flow
1. Shape investigation — 5 minutes
Demonstrate a pin-jointed square and triangulated frame. Say that triangulation can make an idealized frame geometrically stable; joints, material, span, loading, and failure mode still matter.
2. Constraints and evidence cycle — 10 minutes
The classroom comparison uses a 12-inch span, one marked load point, and standardized fictional results. The goal is a comparable result and justified revision, not a winner. Real infrastructure also requires licensed analysis, codes, geotechnical evidence, public review, and long-duration validation.
3. Compare bridge systems — 10 minutes
Use teacher-curated beam, truss, and arch visuals. Explain that performance depends on the complete system; do not force every team toward a predetermined truss answer.
4. Draw two options and critique — 20 minutes
The packet gives Option A and B a landscape drawing page with separate top and side fields. Students label the 12-inch span, supports, members, joints, load point, expected load path, and predicted weak point. Each student records one critique and the evidence behind the final choice.
5. Exit — 5 minutes
Name the civil/structural/technician role responsible for the next project step, what evidence that worker needs, and what the worker would produce.
Access and Absence Route
Use tactile or large-print geometry, verbal description, typing, dictation, or a teacher scribe. Absent students complete both options and use the same sample data on Day 4.
Monitor at minutes 10, 25, 38, and 45 for constraints, Option A, a meaningfully different Option B, and the supported choice/role response. If one-third changed only color or decoration, reshow the model. Accept clean labeled line diagrams and concise strengths when time is short; protect both distinct options, the supported choice, and the individual career-role evidence. Collect one annotation/upload or packet and stack rulers.