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Textbook Questions 
3. How are users involved in the building of a prototype?
Users are involved in the building of a prototype by supplying feedback and identifying errors in the prototype.
4. How are communication skills important in prototyping?
Communication skills are important in prototyping because while the system developers produce the prototype, they depend on the feedback given by the users to improve the proposed system.
5. How can a spreadsheet be used as a model?
A spreadsheet can be used as a model by describing parts of the system and allowing others to understand it better.
Classwork: [link]