Lesson 6 of 9
Plan it before you start
Show on a big screenA wet cloth dries on a line. Here are four things to change and two to observe. Pick one below.
Step 1 of 4
- Sunday: the plan is written first.
- Monday to Friday: the tests are done.
- Adding "keep the cloth same" on Friday is too late.
- The verdict is tied to Sunday's plan.
A plan made after the results can be chosen to fit them. So plan first.
The rule
Plan the test before you start. Name the claim. Change one thing and keep the rest the same. Keep a comparison group. Write down what you see as you go.
Pick the one thing to change. The plan card fills in.
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Try the lab to finish this lesson.