1. Scratch –Think Like a Computer
Module 2 Lesson 1
Take out a piece of paper and head it with
Your Name
Scratch Mod 2 Lesson 1

2. Learning Objectives
To understand how computers interpret instructions even if this means that the outcome is unexpected.
To show that the person writing a computer program must have a very clear understanding of what needs to be done before writing the computer program.
Once a computer program has been written it can be tested to make sure it functions as expected.

3. Would it be good if… People followed instructions exactly?
“Go through that door”
“All hands on Deck”
“My way or the highway”
“That will cost you an arm and a leg.”

4. Take out three pieces of paper
Need three volunteers.
Volunteers will go outside the class and develop instructions on how to draw the image given to them.

5. Draw the first Image
No Talking allowed

6. Check the Image Hold up your drawings
What were some of the problems you faced when trying to make the image?

7. Second Image Yes/No questions are allowed from the user (class)
However, the programmer may not look at the drawings.
The programmer may not ask questions

8. Check the Image Hold up your drawings
What were some of the problems you faced when trying to make the image?

9. Third Image Yes/No questions are allowed from the Programmer.
No questions allowed from the user (class).

10. Check the Image Hold up your drawings
What were some of the problems you faced when trying to make the image?

11. Which drawing was easier to draw?
Why?
Was it helpful to be able to ask questions?
Was it helpful to have the programmer able to ask questions?
What would have been more helpful?

12. Summary Any unexpected outcomes?
Do you see some things that can happen if a program is not clear?
What about the importance of testing?
Questions from the program to check the users progress.

13. Activity
Using what you have learned today, write out the best instructions possible to create the last drawing.
When completed, turn it into the Macintosh