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When the sun goes down on the paper plate it will make a shadow that tells the time.

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A. What is the problem??
B. What have others done to solve the problem?
C. What are the criteria and constraints? Criteria includes the specifics of the problem which need to be followed. Constraints may include materials available, cost, and time.

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A. What are some solutions?  Brainstorm and list them.
B. Choose the best idea and explain why you think it is the best.
C. Brainstorm ideas for each part of the design chosen by your team and be sure everyone can explain the choices.

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A. Draw a diagram of your design.  On the drawing clearly label all parts.
B. Make a list of the materials you will need.

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A. Follow your plan and build the model.
B. Test it out!

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A. What works?  What doesn't?
B. What could work better?
C. Modify your design to make it better.