Topic summary: Criteria and constraints
One rule per lesson, in order, on one drawing. Then three easy questions.
Video rendering. This video is in the Peps pipeline (about 49 seconds, 98 spoken words). Until it lands, the storyboard below is the video, beat by beat.
The script (narration and what is on screen) — open
| # | Narration | On screen |
|---|---|---|
| 1 | Here's everything we found out about criteria and constraints. | Erin's tall holder and Luis's wide holder on the desk; Mr. Park's list card beside them |
| 2 | A criterion is a job the design must do, that anyone can test. | the list's first two lines glow; chip CRITERIA |
| 3 | A constraint is a limit on what you may use: the materials, the time, the money or the space. | the list's third line glows; chip CONSTRAINT |
| 4 | A test checks a criterion only when it does what the criterion says. | ten pencils drop into Luis's holder; the desk wobbles with three motion lines |
| 5 | To compare two designs, give both the same test. | both desks wobble with three motion lines; chip HARD BUMP over each |
| 6 | A design solves the problem when every criterion is met and no constraint is broken. | green ticks appear beside all three lines of the list |
| 7 | When a design fails, change the part that failed, and test it again the same way. | Erin's holder with its wider bottom; the desk wobbles; the holder stays up |
| 8 | Okay, now your turn. | the three attached questions appear |
Okay, now your turn
After the video · 1 of 3
A class is designing a lunch bag. Which sentence is a criterion?
After the video · 2 of 3
A paper hat must stay on in the wind, using only one sheet of newspaper. Three hats are tested. Which hat solves the problem?
After the video · 3 of 3
A cardboard ramp bends in the middle when a toy car rolls down it. What should happen next?