What are the stages of the design process, and why is it iterative rather than a straight line?
The stages of the design process from brief to resolved proposal: the design brief, specification, generating and developing ideas, modelling, evaluating, and the iterative design/make/test cycle in which ideas are refined and resolved on an ongoing basis.
A focused answer to the SQA National 5 Design and Manufacture content on the design process, covering the brief, specification, idea generation, development, modelling and evaluation, and the iterative design/make/test cycle that refines and resolves a proposal.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
The SQA wants you to know the stages of the design process in order, and to understand that it is iterative - a loop of design, make and test, not a one-way street. This is the backbone of the whole Design area: the other topics (research, idea generation, communication, evaluation) are stages within it.
The stages in order
The usual National 5 sequence is:
- Brief. Understand the problem, the client and the target user.
- Research. Investigate the problem, existing products, materials and the user's needs.
- Specification. Turn the research into a measurable list of requirements.
- Generate ideas. Produce a range of possible solutions through sketching and creativity techniques.
- Develop and model. Improve the strongest ideas and make models to test them.
- Evaluate. Judge ideas and models against the specification.
- Resolve. Refine the chosen proposal until it fully meets the brief.
Why the process is iterative
The stages are not a straight line. Designers move backwards and forwards, repeating stages as they learn more.
For example, modelling an idea may show it is too weak; the designer loops back, changes the material or shape, models again and re-tests. This ongoing evaluation and resolution is exactly what the SQA means by an iterative process.
Modelling within the process
Modelling is making a representation of an idea to test it, ranging from quick card or foam mock-ups to detailed prototypes and CAD models. Modelling lets the designer check size, shape, fit, function and appeal before committing to manufacture. The results of modelling drive the next iteration.
Try this
Q1. State what a design brief is. [1 mark]
- Cue. A short statement of the problem to be solved, who it is for and the main constraints.
Q2. Describe the difference between a brief and a specification. [2 marks]
- Cue. The brief states the problem in general terms; the specification lists the measurable requirements the product must meet, written after research.
Q3. Explain one benefit of the design/make/test cycle. [2 marks]
- Cue. Testing models reveals faults early, so the design is improved before manufacture, saving time and money and raising quality.
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-style Describe4 marksDescribe the stages a designer would work through to take a design brief to a resolved proposal.Show worked answer →
Award 1 mark per stage described, up to 4. The designer first studies the design brief to understand the problem, the client and the user (1). Research is carried out and a specification is written, listing the measurable requirements the product must meet (1). Ideas are generated through sketching and other creativity techniques, then the best ideas are developed and modelled to test them against the specification (1). The proposal is evaluated and refined through the design/make/test cycle until it is resolved and meets the brief (1). Markers reward stages that are described, in a logical order, rather than a bare list of single words.
SQA-style Explain3 marksExplain why the design process is described as iterative.Show worked answer →
Award up to 3 marks for explained points. The design process is iterative because the designer repeatedly designs, makes (or models) and tests, then uses what is learned to improve the idea, rather than working in one straight line (1). Testing a model or prototype reveals faults or weaknesses, so the designer loops back to change the design and tests again, which raises the quality of the final product (1). This ongoing refinement means problems are found and fixed early, before expensive manufacture, saving time and money (1). Markers reward the idea of repeating and improving, linked to a benefit.
Related dot points
- The design factors that influence the design of a product: function, performance, aesthetics, ergonomics (anthropometrics, physiology and psychology), market and consumer demands, economic factors, environmental factors and safety, and the tensions and trade-offs between them.
A focused answer to the SQA National 5 Design and Manufacture content on design factors, covering function, performance, aesthetics, ergonomics (anthropometrics, physiology, psychology), market, economic, environmental and safety factors, and the trade-offs designers make between them.
- Researching a design problem and writing a specification: methods of research (investigating existing products, the user, the market and materials), product analysis, and turning findings into a measurable design specification used to judge proposals.
A focused answer to the SQA National 5 Design and Manufacture content on research and specification, covering research methods, product analysis against design factors, and how findings become a measurable design specification that proposals are judged against.
- Generating and developing ideas: creativity and idea-generation techniques (brainstorming, morphological analysis, mind mapping, lateral thinking), divergent and convergent thinking, and developing chosen ideas through modelling towards a workable proposal.
A focused answer to the SQA National 5 Design and Manufacture content on generating and developing ideas, covering creativity techniques such as brainstorming and morphological analysis, divergent and convergent thinking, and developing chosen ideas through modelling.
- Evaluating and resolving design proposals: testing ideas and models against the specification, using objective and subjective evaluation, identifying improvements, and refining a proposal on an ongoing basis until it is resolved and meets the brief.
A focused answer to the SQA National 5 Design and Manufacture content on evaluating and resolving design proposals, covering objective and subjective evaluation against the specification, identifying improvements, and refining a design until it is resolved.
- Overview of the assignment - design: the externally assessed coursework in which a candidate develops a design proposal in response to a set brief, applying research, specification, idea generation, development, communication and evaluation, worth 55 of the 180 course marks.
An overview of the SQA National 5 Design and Manufacture assignment - design: the externally assessed coursework in which a candidate develops a design proposal to a set brief, what skills it assesses, and how it fits the 180-mark course assessment.