How do graphics and models help a designer generate, test, refine and communicate a proposal?
The use of graphics and modelling in the design process to generate and explore, test and refine, and communicate, including physical models (sketch, block, scale, test rigs, prototypes) and computer-generated models and simulations.
An SQA Advanced Higher Design and Manufacture answer on graphics and modelling in the design process, covering how each is used to generate and explore, test and refine, and communicate, and the purpose of sketch, block, scale and test-rig models, prototypes, and computer-generated models and simulations.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this key area is asking
The SQA wants you to know how graphics and modelling are used at every stage of the design process, for three purposes: to generate and explore, to test and refine, and to communicate. You must know the purpose of, and information gained from, the named physical models (sketch, block, scale, test rigs, prototypes) and computer-generated models and simulations. In the assignment, applying graphic techniques and applying modelling techniques are two separately marked criteria (12 marks each), and manufacturing a presentation model is a third.
The three purposes of graphics and modelling
The same proposal is graphicked and modelled differently at each stage: fast and rough to generate and explore, accurate to test and refine, realistic and precise to communicate to a client or maker. Crucially the process is iterative: a model is built to test something, the test produces information, and that information changes the next graphic or model.
Graphics in the design process
Graphics range from freehand to formal, each suited to a purpose:
- Freehand sketches and thumbnails generate and explore ideas quickly, with no equipment, so the designer can put many options on paper.
- Annotated development sketches test and refine, recording the reasoning, changes and evaluation against the specification.
- Rendered illustrations and pictorial views communicate the look and feel of a proposal to a client realistically.
- Working and technical drawings communicate precise, dimensioned information to a maker so the product can be made without ambiguity.
In the assignment, graphics must show the development, not just the final answer: the marker rewards evidence of ideas being explored and refined.
Physical models
Each gives different information:
- Sketch models (foam, card, clay): explore form, scale and proportion early; cheap and quick, so many can be made.
- Block models: more accurate solid models, sized from anthropometric data, to test feel in the hand and whether controls fall to reach (ergonomics).
- Scale models: a faithful representation, full size or reduced, mainly to communicate the proposal.
- Test rigs: built to measure one aspect of performance objectively and repeatably (a hinge-cycle or load rig).
- Prototypes: working versions used to test function and for user trial; the closest model to the real product.
Computer-generated models and simulations
CAD models and simulations have distinct strengths:
- Easy to edit and reuse, so iteration is fast and a change flows through to drawings and renders;
- Rendered realistically to communicate the look to a client without a physical model;
- Simulated to test virtually before anything is made (stress analysis to find weak points, motion studies to check clearances and movement, fit checks of an assembly);
- able to drive CAM machines directly, linking development to manufacture.
The strongest development uses both: CAD and simulation to iterate cheaply and find problems, and physical models and prototypes to test feel, function and real-use that a screen cannot capture.
Where this fits in the course
Graphics and modelling carry the development between idea generation and the resolved design, and are three separately marked assignment criteria. The information gained feeds conflict resolution and links to designing for manufacture, since CAD models become the basis for tooling.
Try this
Q1. Explain the difference between a block model and a prototype. [3 marks]
- Cue. A block model tests scale, feel and ergonomics accurately but does not work; a prototype is a working version that tests function and is trialled by users.
Q2. Explain two purposes of graphics in the design process. [4 marks]
- Cue. To generate and explore ideas quickly (freehand sketches); and to communicate precise information to a maker (dimensioned working drawings).
Q3. Explain why a designer might simulate a design before making a physical model. [3 marks]
- Cue. Simulation tests the design virtually (stress, motion, fit), finding and fixing problems before any material is cut, which saves time and cost.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA Advanced Higher6 marksExplain how a designer uses modelling to develop a design proposal.Show worked answer →
Worth about 6 marks, so the marker wants modelling linked to the three
purposes (generate and explore, test and refine, communicate), with
examples of model types.
Generate and explore. Quick sketch models in foam or card let the designer
explore form, scale and proportion in three dimensions early, faster than
committing to a finished model.
Test and refine. Block models and test rigs check fit, feel and function:
a block model sized from anthropometric data is held to test ergonomics,
and a test rig measures performance, with the findings fed back to refine
the proposal.
Communicate. A scale model or a prototype communicates the proposal to a
client or user far better than a drawing, and a working prototype lets
target users trial it. A strong answer states that modelling is iterative:
each model tests something, and the result changes the next model.
SQA Advanced Higher4 marksExplain two advantages of using computer-generated models and simulations during development.Show worked answer →
Worth about 4 marks. The markers want advantages specific to CAD models
and simulation, each developed.
Easy to edit and reuse. A CAD model can be changed quickly and the change
flows through to drawings and renders, so the designer can iterate far
faster than rebuilding a physical model each time.
Simulation before making. Simulations test the design virtually, for
example stress analysis to find weak points or motion studies to check
clearances, so problems are found and fixed before any material is cut,
saving time and cost.
Communication and manufacture. A strong answer adds that rendered CAD
models communicate the proposal realistically and the same model can drive
CAM machines, linking development to manufacture.
Related dot points
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An SQA Advanced Higher Design and Manufacture answer on idea-generation techniques, covering the use of idea generation in the design process and the key stages of analogy including technology transfer and biomimicry, brainstorming, and morphological analysis.
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An SQA Advanced Higher Design and Manufacture answer on defining a design opportunity, covering the purpose of the design brief, why opportunities occur, primary and secondary research and its techniques, and the product design, performance and technical specifications that turn research into testable requirements.
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An SQA Advanced Higher Design and Manufacture answer on conflict resolution, covering the conflict and balance between competing design issues, between society, economics and the environment, and between consumers, designers and manufacturers, and the methods used to reach a balanced proposal.
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An SQA Advanced Higher Design and Manufacture answer on designing for manufacture, covering mould and pattern design, wall thickness, split lines, draft angles, fillets and radii, undercuts, shrinkage and thinning, integrated assembly features, and the purpose of bosses, ribs and webs in moulded parts.
- Overview of the Advanced Higher Design and Manufacture coursework assignment: a 120-mark candidate-led design folio that defines a design opportunity and develops a commercial-product proposal, applying design, materials and manufacture knowledge and producing a presentation model, marked against ten criteria.
An SQA Advanced Higher Design and Manufacture overview of the 120-mark coursework assignment, a candidate-led design folio that defines a design opportunity and develops and models a commercial-product proposal, marked externally against ten criteria from defining the opportunity to manufacturing a presentation model.