This presentation explores a scaffolded approach to teaching engineering principles and systems through bridge design in Junior Secondary Design Technologies. The session draws on a sequence of connected learning experiences across Year 9 STEM, Year 9 Technologies (Wood/Plastics), and participation in the ENABLE Bridge Building Competition, which evolved from the Aurecon Bridge Building Challenge.

Participants will see how students progress from conceptual understanding of forces, materials and structures, through iterative design processes using sketching, CAD modelling (Autodesk Inventor), finite element analysis simulation, laser cutting and physical testing.

The session demonstrates how authentic engineering contexts can be used to develop deep understanding of tension, compression, load distribution and structural efficiency, while supporting student development in problem solving, evaluation and optimisation.

The presentation will include examples of:

scaffolded folio structures
cognitive verb alignment with ACARA Version 9
assessment design linking theory to prototype testing
strategies for improving student iteration and refinement
integration of competition contexts to increase engagement and authenticity

Examples of student work, assessment instruments and unit structures will be shared.

The session is suitable for teachers delivering Years 7–10 Design Technologies, STEM or Engineering contexts, particularly those seeking authentic project-based learning aligned with AC9TDE10K03 Engineering principles and systems.

Supporting materials include unit plans and assessment structures used in classroom implementation