Design Strategies
What Is a Design Strategy?
A design strategy is the overarching approach a designer chooses before any sketching or modelling begins. The strategy shapes every decision that follows: how much time is spent on research, whether users are consulted, and how many times the design is revised. You need to know six named strategies, understand when each suits a project, and weigh up the advantages and disadvantages of each.
Linear Design
Linear design follows a step-by-step sequence: analyse the brief, research, write a specification, generate ideas, make a prototype, then evaluate. Each stage is completed before the next begins, and the process does not loop back. This approach suits projects with a very clear, stable brief — for example, manufacturing a replacement component to an agreed technical standard where the requirements are already fully known.
The main advantage of linear design is its predictability: timelines and budgets are easier to plan because the scope is fixed. The disadvantage is inflexibility — if a problem is discovered late in the process (say, during manufacture) there is no formal mechanism to revise the design, which can be costly.
The six design strategies you must know are: linear, iterative, inclusive, user-centred, sustainable, and ergonomic design. Questions may ask you to recommend one strategy for a given context and justify your choice — always name the strategy precisely and then explain why it fits that scenario.
Iterative Design
Iterative design is a cyclic process: the designer produces an idea, tests or evaluates it, identifies weaknesses, then redesigns and tests again. Each loop refines the product. This strategy suits complex or novel products where requirements are not fully understood at the start — consumer electronics, medical devices and bespoke engineering solutions all benefit from an iterative approach.
The advantage of iterative design is that problems are caught early and the product is progressively improved to better meet the brief. The disadvantage is that the process can be time-consuming and expensive if many revision cycles are needed, and it requires clear decision criteria for when to stop iterating.
Inclusive Design
Inclusive design aims to create products that can be used by the widest possible range of people, regardless of age, ability or background — without the need for specialist adaptation. A classic engineering example is the OXO Good Grips peeler, designed so that people with limited grip strength (including those with arthritis) can use it as easily as anyone else. Inclusive design suits products that will be used in public spaces or by diverse populations.
The advantage is that an inclusive product reaches a larger market and avoids the need for costly specialist versions. The disadvantage is that designing for the full range of users can add complexity and cost to the development process, and may mean compromising on optimisation for any one group.
User-centred design (UCD) places the needs, preferences and limitations of the end user at the centre of every design decision. Designers gather detailed user research — through interviews, observation and testing — and continually involve users throughout the process. UCD suits consumer products where user experience is critical, such as smartphone interfaces, hospital equipment or workplace tools. The advantage is that the final product is highly likely to meet real user needs, reducing the chance of market failure. The disadvantage is that extensive user research and testing adds time and cost, and user feedback can sometimes conflict or be difficult to interpret.
Sustainable Design
Sustainable design considers the environmental impact of a product across its entire lifecycle — from raw material extraction through manufacture, use and eventual disposal. Designers using this strategy might choose recycled materials, minimise energy use in manufacture, or design for disassembly so components can be reused. It suits any product where environmental credentials are a key market requirement — from packaging to renewable energy hardware.
The advantage of sustainable design is reduced environmental impact and, increasingly, commercial appeal as consumers prioritise green credentials. The disadvantage is that sustainable materials and processes can cost more, and life-cycle analysis adds complexity to the design process.
Linear design is the only strategy that does not include a formal feedback loop — all other strategies involve some form of review or refinement. This distinction is important: exam questions frequently ask you to explain why a company chose an iterative rather than a linear approach, or vice versa.
Ergonomic Design
Ergonomic design optimises the interaction between a product and the human body — considering posture, reach, force, comfort and safety. Engineers use anthropometric data (measurements of human body dimensions) to ensure products fit the range of users. Ergonomic design is essential for tools, workstations, vehicles and any equipment used repeatedly over long periods, where poor fit leads to injury or error.
The advantage of ergonomic design is improved user safety and comfort, which reduces injury rates and increases productivity. The disadvantage is that designing for the full range of body sizes requires detailed anthropometric research, and it may not always be possible to satisfy every user simultaneously — some products are designed for the 5th to 95th percentile range, which still excludes a small proportion of users.
Exam questions will often give you a design scenario and ask which strategy would be most appropriate. Use this logic: if the brief is fixed and the product is a known type (e.g. replacing a standard bracket), linear design is efficient. If the product is novel or complex, iterative design allows refinement. If the product must serve diverse or less-abled users, consider inclusive or user-centred design. If the client specifically requires low environmental impact, sustainable design is the priority. If the product is worn or handled repeatedly and must fit the human body well, ergonomic design takes precedence. A strong answer will name the strategy, describe its key feature, and link it directly to the scenario — never just list strategies without explanation.