The big idea: A UCD team develops a deep understanding of the user, the task and the environment.
No single discipline covers all three — which is why the team is multidisciplinary rather than just large.
Each discipline placed under the one of the three it strengthens. Step through to see what each actually contributes.
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The user
- Psychologist — how users perceive, decide and err under pressure
- Ergonomist — anthropometric and physiological limits
- Together: what the user can actually do
The task
- Engineer — whether the task can be performed at all
- Product designer — turning what the task needs into a usable form
- Together: can it work, and can they work it
The environment
- Anthropologist — how setting, culture and routine shape use
- Marketer — which markets and conditions it reaches
- Together: what the real world will do to it
Two more names to know: an ethnographer studies the customs and daily routines of people and cultures by watching them in their own settings, and a psychologist studies how users think, perceive, decide and react.
The point is not more opinions: Each discipline notices a failure the others are not equipped to see. An ergonomist spots a reach problem an engineer will not; an anthropologist spots a routine problem neither will.
See how examiners mark answers
Answer exam-style questions with model answers. Learn exactly what earns marks and what doesn't.
All engineers
The product works flawlessly and nobody can operate it. Controls are laid out by circuit convenience rather than by the order the user does things.
All stylists
The product is beautiful, cannot be manufactured at the target cost, and the flush handle cannot be gripped in gloves.
All ergonomists
Every dimension fits and the product is dull, expensive and late. Fit is necessary; it is not sufficient.
All marketers
It sells well once and is never bought again, because the thing that made it appealing on a shelf makes it annoying on a worktop.
In the exam: A question about team composition wants you to link a discipline to one of the three and say what it contributes. "They bring different ideas" is not an answer.
The cost of a mixed team: A multidisciplinary team has drawbacks too. Specialists use different language and priorities, so communication takes longer and disagreements are more likely; more people means higher cost; and decisions can be slower while each discipline is heard.
How this is tested — explaining what each discipline contributes to understanding the user, task and environment. It comes up two ways:
Paper 1 — multiple choice
- Match a discipline to the aspect it mainly informs.
- Identify the specialist missing from a described team.
Paper 2 — analysing a product
- Explain how named disciplines improve the design of a product.
- Explain the risk of a design team drawn from one discipline.
The trap: Listing job titles with no contribution attached. Each discipline has to be tied to the user, the task or the environment, with something it tells the team that nobody else can.
A team designing a portable defibrillator for public places consists only of electronic engineers. Explain two specialists it should add and what each would contribute.
Model answer plan
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