Designing for actual users
| English | 中文 | Pinyin |
|---|---|---|
| ergonomics/ˌɜːɡəˈnɒmɪks/ | 人体工程学 | rén tǐ gōng chéng xué |
| specification/ˌspesɪfɪˈkeɪʃn/ | 设计规格 | shè jì guī gé |
What would explain this observation?
- A handle that feels comfortable to its designer may exclude another user. Design evidence starts with the people and context of use.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Anthropometric data describe body dimensions. Ergonomics 人体工程学 concerns the relationship between people, tasks and products. A design specification 设计规格 turns a user need into a measurable requirement.
- ergonomics: Designing the fit between people, tasks and products; specification: Measurable requirements a proposed solution should meet.
Which is a testable requirement?
Choose data for the target population and task. Clearance often needs a larger-user percentile; reach may need a smaller-user percentile. A single mean dimension cannot satisfy every design constraint.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Choose data for the target population and task. Clearance often needs a larger-user percentile; reach may need a smaller-user percentile. A single mean dimension cannot satisfy every design constraint.
- Observe an approved low-risk task with consent, interview users without leading questions, and record measurable success criteria. Test an early model before committing to expensive materials. Do not collect unnecessary personal measurements.
Which two habits make the investigation or model in this case more defensible?
Observe an approved low-risk task with consent, interview users without leading questions, and record measurable success criteria. Test an early model before committing to expensive materials. Do not collect unnecessary personal measurements.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a handle must withstand a 40 N use force with a design safety factor of 2.5. Target test load = use force × factor = 40×2.5 = 100 N. The factor is a design assumption to justify; it is not a substitute for a supervised safety review.
A use force is 30 N and selected safety factor 3. Find target load. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A use force is 30 N and selected safety factor 3. Find target load.
The result is 90 N. Known: a handle must withstand a 40 N use force with a design safety factor of 2.5. Target test load = use force × factor = 40×2.5 = 100 N. The factor is a design assumption to justify; it is not a substitute for a supervised safety review.
Check the conclusion and its limits
- A specification is not a list of vague wishes such as nice or strong. User testing should evaluate measurable requirements and reveal conflicting needs.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
A population mean dimension always accommodates every user. This claim is false: A specification is not a list of vague wishes such as nice or strong. User testing should evaluate measurable requirements and reveal conflicting needs.
Designing for actual users: Choose data for the target population and task. Clearance often needs a larger-user percentile; reach may need a smaller-user percentile. A single mean dimension cannot satisfy every design constraint.
A population mean dimension always accommodates every user.
A specification is not a list of vague wishes such as nice or strong. User testing should evaluate measurable requirements and reveal conflicting needs.
Designing the fit between people, tasks and products: write the technical term.
ergonomics means Designing the fit between people, tasks and products.