AQA A-Level Design and Technology: Product Design 3.1 Technical principles: a complete overview of materials, manufacture, smart materials, digital design and systems

What Technical principles demands

Technical principles (specification section 3.1) is the materials-and-manufacturing backbone of AQA A-Level Design and Technology Product Design. It is where most of the recall and applied technical marks sit, and the knowledge feeds directly into the non-exam assessment, where you must justify the materials and processes used in your own product.

This guide walks through the six areas in specification order, then sets out the exam patterns the written papers repeat. Each area has a matching dot-point page with practice questions; this overview ties them together.

Materials, properties and performance

The section opens with the classification of materials into papers and boards, timbers, metals, polymers, composites and technical textiles, and the physical properties (density, conductivity, optical and magnetic behaviour) and mechanical properties (tensile and compressive strength, hardness, toughness, ductility, malleability, elasticity and fatigue resistance) used to select them. Performance characteristics then cover how treatments, coatings and finishes change a material, the stock forms and standard components materials are supplied in, and the standard tests (tensile, hardness, impact and fatigue) used to measure performance against published data.

Manufacturing and scales of production

The manufacturing processes area covers shaping, forming, casting, moulding and joining for each material family, and crucially how the scale of production (one-off, batch, mass and continuous) determines the process, the tooling and the unit cost. The key idea is that expensive dedicated tooling such as an injection-moulding die is only economic at high volume, while cheap flexible methods suit one-off and batch work.

Modern materials, digital manufacture and systems

The remaining areas modernise the toolkit. Modern and smart materials introduce graphene, titanium and metal foams alongside responsive smart materials (shape-memory alloys, thermochromics, piezoelectrics and electroluminescent wire). Digital design and manufacture covers CAD, CAM, CNC machining, additive manufacturing, robotics, flexible manufacturing systems and the global supply chain. Energy and mechanical systems covers energy sources and storage, the four types of motion, levers, linkages, cams, gears and pulleys, and electronic and programmable systems.

How Technical principles is examined

A typical profile for the Technical principles paper (Paper 1):

• Short-answer and multiple-choice recall. Naming properties, materials, processes, motions and safety facts.
• Applied selection. Justifying a material, finish or process for a given product, linked to the user, function and scale of production.
• Calculations. Gear ratios, simple mechanical advantage and reading values from data.
• Extended response. Comparing processes or materials and reaching a justified recommendation.

Check your knowledge

A mix of recall and applied questions covering the Technical principles content. Attempt them under timed conditions, then check against the solutions.

1. Name the two main categories of polymer and the key difference between them. (2 marks)
2. Distinguish between a treatment and a finish, with an example of each. (2 marks)
3. Explain why injection moulding suits mass production but not a one-off prototype. (3 marks)
4. Define a smart material and give two examples. (3 marks)
5. State the difference between additive manufacturing and CNC machining. (2 marks)
6. Name the four types of motion. (2 marks)
7. A driver gear has 15 teeth and the driven gear has 45 teeth. State the gear ratio and its effect on speed and torque. (3 marks)
8. Explain one advantage and one disadvantage of using robots in manufacture. (3 marks)