Plan the model or prototype.

Planning should include
•    definition of model
•    definition of prototype
•    list of materials
•    required tools
•    relevant processes.

Process/Skill Questions:

•    What is a model? 
•    What is a prototype? 
•    What is the relationship between a model and a prototype?
•    What are the differences among a model, a prototype, and a mock-up?
•    Why is the model or prototype proposed the best to resolve the problem?
•    What are the specific materials, tools, and processes necessary to create the model or prototype?
•    What will serve as alternatives to the selected tools if they are unavailable?