Compare prototypes with a fair test
The idea
Name the feature being tested and the outcome you will measure.
Step by step
- Name the feature being tested and the outcome you will measure.
- Keep other conditions consistent so they do not offer competing explanations for the result.
- Repeat the comparison and record results in the same units.
Example
A team wants to test how ramp height affects its model. It can use the same car and surface. Which comparison best isolates the effect of ramp height?
Answer
Change ramp height while keeping the car and surface the same.
Only the named design feature changes, so the comparison gives clearer evidence about that feature.
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Test two paper-bridge widths across the same gap using the same paper type. Count the same kind of counters each bridge supports.
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