Select and use appropriate materials, tools, techniques and processes to produce a quality solution, applying knowledge of material properties, processing methods and quality control

What this dot point is asking

NESA wants you to select materials and apply the tools, techniques and processes that turn a design into a quality finished solution. This requires understanding material properties, choosing the right processing methods, controlling quality, and producing safely and skilfully. It is the practical heart of realising the Major Design Project.

The answer

Understanding material properties

Choosing a material starts with understanding its properties. These include mechanical properties such as strength, hardness, flexibility and durability; physical properties such as density, conductivity and resistance to heat or moisture; and aesthetic properties such as colour, texture and finish. A material is only suitable if its properties match what the solution must do. Selecting it also means weighing cost, availability, workability, safety and sustainability against the criteria.

Material selection

Selection is a justified decision, not a default. The designer compares candidate materials against the requirements of the brief and the criteria, considering function, cost, the available tools and skills, environmental impact and the user. Documenting why a material was chosen, with reference to research and testing, demonstrates informed design rather than habit.

Processing techniques

Turning material into a product uses a range of processing techniques, which differ by material but share common categories:

• Shaping and forming, such as cutting, machining, moulding or bending material to size and form.
• Joining and assembly, such as fastening, adhesives, welding or stitching, to bring parts together.
• Finishing, such as sanding, coating, painting or sealing, to protect the product and improve its appearance.

Selecting the correct technique for the material and the job, and applying it skilfully, is directly assessed in the project.

Scale and method of production

The method of production depends on how many are being made. One off or custom production suits a unique Major Design Project, while batch and mass production suit larger quantities and use different equipment, jigs and automation. Understanding the scale of production helps you choose appropriate processes and explains how a commercial version of your solution might be made even if you produce only one.

Quality control and tolerance

Quality control means checking, throughout production, that the solution meets the required standard rather than inspecting only at the end. Key ideas include:

• Tolerance, the acceptable range of variation in a dimension or property.
• Checkpoints, planned points in production where work is measured against the criteria.
• Testing, confirming that joints, finishes and function perform as intended.

Building quality control into the production sequence catches problems early and produces a better finished solution.

Safe and skilful production

Production must be safe as well as skilful. Applying work health and safety, using tools correctly and following safe operating procedures protects the maker and is assessable. Skilful, accurate production with good quality control is what produces a solution judged high on quality and fitness for purpose.

Why this matters in the HSC

Materials, tools and techniques are realised in the development and realisation section of the folio and seen in the finished solution. Justified material choices, appropriate techniques, evidence of quality control and safe, skilful production all earn marks. In the written paper, questions on material properties, production methods or quality control reward specific, applied knowledge over generic description.