Use a design’s purpose and limits
The idea
A criterion tells what success looks like; a constraint limits materials, size, cost or time.
Step by step
- A criterion tells what success looks like; a constraint limits materials, size, cost or time.
- Read all the requirements before choosing or testing a design.
- Check the purpose and the limits together; meeting just one is not enough.
Example
A class designs a bridge. It must hold a 200 g toy and at most two sheets of card. Which test checks both requirements?
Answer
Hold the toy using two or fewer sheets.
The test checks the desired result and the stated limit together.
Start quiz5 questions
5 questionsTry it together
Design a paper carrier for three blocks with one sheet. Write its success criterion and material limit before building.
Share practice
