Redesigning for Improvement

Unit Context

This is Lesson 6 of 8 in the unit Building Bridges: Engineering Skills. Students have built and tested initial designs of bridge models. In this lesson, they will analyse their test results, collaborate to brainstorm improvements, and plan adjustments before the final construction stage.

Duration

45 minutes Class size: 20 students Year level: 8 (Stage 4)

NSW Curriculum Links: Design and Technologies (Years 7–8)

Learning Area: Technologies Subject: Design and Technologies

Relevant Outcomes

• ACTDEP028: Plan and document design processes, and use techniques to represent design ideas, materials, components, tools, equipment and processes.

• ACTDEP029: Produce designed solutions for a range of technologies contexts that respond to needs or opportunities, including sustainability considerations.

• ACTDEP030: Critique design processes and solutions to identify how they could be improved.

• ACTDEP031: Work individually and collaboratively to safely plan and manage projects to create designed solutions.

These outcomes support students to develop and adapt design ideas, processes and solutions, which aligns with the lesson focus on redesigning based on test results and collaboration .

Learning Objectives

By the end of the lesson, students will be able to:

• Analyse test data from their initial bridge designs to identify strengths and areas for improvement.

• Collaborate effectively in small groups to brainstorm possible design adjustments and engineering solutions.

• Communicate redesign ideas clearly using appropriate technical vocabulary and visual representation techniques.

• Prepare a modification plan to guide the final bridge construction.

Materials Required

• Initial bridge test results (videos, photos, or written/logged observations)

• Bridge design sketches and notes from previous lessons

• Whiteboards or large paper for brainstorming

• Markers/pens

• Digital devices (tablets or laptops) for documenting redesign plans (optional)

• Bridge models (for reference)

Lesson Outline

Time

Activity

Description

Teaching Notes

0-5m

Engage: Recap and Set Purpose

Briefly recap last lesson’s bridge testing. Pose the question: “What did our tests reveal about our bridges?” Students share one insight.

Link to student prior knowledge; set the inquiry question to spark curiosity about redesign.

5-15m

Analyse: Review Test Results

Organise students into groups of 4. Provide each group with their test data and bridge designs. Guide them to record: “What worked well?” and “What did not?” using a two-column chart.

Support students to use observational and measurement data. Encourage use of technical language (e.g., tension, compression).

15-25m

Collaborate: Brainstorm Solutions

Groups brainstorm at least 3 specific design changes to improve strength, stability or materials use. Write/illustrate ideas on whiteboards or paper. Teacher circulates, prompting with questions: “How can we make the bridge stronger but still lightweight?” “Could the shape be improved?”

Emphasise creativity and engineering thinking. Encourage consideration of sustainability and materials efficiency.

25-35m

Communicate: Group Presentation and Peer Feedback

Each group briefly presents their redesign ideas (2-3 minutes). Other groups ask questions and provide constructive feedback.

Reinforce technical vocabulary; foster respectful listening and critique skills.

35-43m

Plan: Document Redesign Adjustments for Final Build

Students individually or as groups create a clear, annotated plan/sketch detailing their redesign decisions based on the discussion. Use technical terms and graphical representations (labels, arrows).

Encourage use of digital tools if available for neat documentation. Teacher to check plans for feasibility and safety.

43-45m

Reflect and Close

Teacher leads a short reflection: “Why is redesigning important in engineering?” Students share thoughts. Outline that next lessons will involve final bridge constructions implementing these improvements.

Consolidates learning and connects to real-world engineering practice.

Differentiation & Support

• Provide sentence starters and vocabulary lists for students needing language support (e.g., “Our bridge failed because...”, “We could improve the design by...”).

• For advanced students, challenge them to consider environmental sustainability factors in materials or design.

• Use visual supports and diagrams for students who are visual learners.

Assessment

Formative Assessment:

• Observation of student participation in group discussions and brainstorming (collaboration and communication skills).

• Review of two-column analysis charts to assess understanding of test results.

• Evaluation of redesign plans for clarity, technical terminology, and application of feedback.

Success Criteria:

• Student can accurately identify design weaknesses from test data.

• Student successfully proposes logical, feasible improvements.

• Student uses appropriate technical language and graphical conventions in communication.

• Student collaborates respectfully and gives and receives constructive feedback.

Extension Ideas (if time allows or for homework)

• Research famous bridge engineering redesigns and innovations.

• Simulate stress tests with different materials or bridge shapes digitally or through models.

• Investigate sustainability practices in modern bridge engineering.

This lesson emphasises critical design thinking and collaborative problem-solving, directly supporting the NSW Design and Technologies syllabus where students create, critique, and adapt designed solutions while justifying decisions against criteria including sustainability . The focus on reflection and peer feedback prepares students to manage projects collaboratively and communicate effectively, valuable skills in real-world STEM disciplines.

This practical, student-centred approach should engage Year 8 students by making visible the iterative nature of engineering design and the value of teamwork and evidence-based decision making.