A criterion says the job

What this lesson teaches: A criterion is a job the design must do, that anyone can test.

Video rendering. This video is in the Peps pipeline (about 75 seconds, 150 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	Mr. Park's class is designing pencil holders, because pencils keep rolling off the desks.	Mr. Park's classroom; a desk; two pencils roll off the edge; chip THE PROBLEM; no title slide
2	Mr. Park says, "Make a good pencil holder." What counts as good? Erin says tall. Luis says wide. Nobody can test "good." That is not a criterion.	Mr. Park's speech chip MAKE A GOOD PENCIL HOLDER; a tall faint holder and a wide faint holder appear and fade; chip NOT A CRITERION
3	Mr. Park says, "The holder must keep ten pencils standing." Anyone can count ten pencils. That is a criterion.	speech chip MUST KEEP 10 PENCILS STANDING; a plain cup with ten pencils standing in it; chip CRITERION
4	And, "The holder must not tip when the desk is bumped." Anyone can bump it. That is a criterion.	speech chip MUST NOT TIP WHEN THE DESK IS BUMPED; the desk wobbles with motion lines; the cup stays up; chip CRITERION
5	And, "One pencil must come out with one pull." Anyone can pull one. That is a criterion.	speech chip 1 PENCIL OUT WITH 1 PULL; one pencil rises out of the cup by itself; chip CRITERION
6	But, "The holder must look neat." Neat is a judging word: neat to Erin is messy to Luis. Nobody can test it. That is not a criterion.	speech chip MUST LOOK NEAT; the cup unchanged; chip NOT A CRITERION
7	So, here's what we've seen. A criterion is a job the design must do, that anyone can test. Two or more are criteria.	rule slide reuses the ten-pencil cup and the bumped desk; rule text
8	Okay, now your turn.	the attached question appears

Pencils keep rolling off the desks in Mr. Park's class. A pencil holder would fix it. Mr. Park asks the class to design one.

A sentence nobody can test

Suppose Mr. Park just says, "Make a good pencil holder."

What counts as good? Erin says tall. Luis says wide. Nobody can test "good."

So "Make a good pencil holder" is not a criterion.

Sentences anyone can test

Now Mr. Park says, "The holder must keep ten pencils standing up." Anyone can count ten pencils. That is a criterion.

And, "The holder must not tip when the desk is bumped." Anyone can bump the desk and watch. That is a criterion.

And, "One pencil must come out with one pull." Anyone can pull one and watch. That is a criterion.

One more sentence nobody can test

But, "The holder must look neat." Neat is a judging word: neat to Erin is messy to Luis. Nobody can test it. That is not a criterion.

Mr. Park's sentence	Can anyone test it?	Criterion?
Make a good pencil holder.	No. What counts as good?	No
The holder must keep ten pencils standing up.	Yes. Count the pencils.	Yes
The holder must not tip when the desk is bumped.	Yes. Bump the desk and watch.	Yes
One pencil must come out with one pull.	Yes. Pull one and watch.	Yes
The holder must look neat.	No. Neat to one person is messy to another.	No

A criterion is a job the design must do, that anyone can test.

Two or more are criteria.

Okay, now your turn

One easy question straight after the video: the student answers it to move on.

After the video

A class is designing a paper cup. Which sentence is a criterion?

Quiz

(a) fluency: a case and the yes / no the concept decides. Fresh contexts, never the lesson's own pencil holder.

Question 1

A class designs a bird feeder. "The feeder must hold one cup of seed." Is this a criterion?

Question 2

"The feeder must be the best one in the class." Is this a criterion?

Question 3

A class designs a paper boat. "The boat must look cool." Is this a criterion?

Question 4

"The boat must float for one minute with a coin on it." Is this a criterion?

Question 5

A class designs a bookmark. "The bookmark must stay in the book when the book is shaken." Is this a criterion?

Question 6

"The bookmark must be easy to use." Is this a criterion?

Question 7

A job a design must do, that anyone can test, is called a …

Question 8 · write a sentence

A class is designing a paper airplane. Write one criterion for it. Start with "The airplane must …"

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