1. COEN/ELEC 390 1

2.  What is prototyping  Why prototyping  Types of prototyping  Advantages of each  Recommendations  Incremental Development? 2

3.  Waterfall model..  Does not really work Design / Coding / Integration Test / Acceptance Test Design 49.2 / 34.1 / 10.3 / 6.4  Hence, prototyping is used to clarify requirements  The first push-button phone had 2000 prototypes built! 3

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5.  ~ 0 cost of fabricating different versions  Most cost associated with developing the first fully working version  Hence, software prototyping used for: ◦ Rapid development of a basic & inefficient executable version ◦ Rapid development of the user interface  This assumes throw-away prototyping 5

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7.  Throw-away prototyping actually saves money by eliminating the need for expensive late-cycle re- engineering  To ensure it is thrown away, a very high-level language is used  This contrasts with evolutionary prototyping, where the prototype grows into the final product 7

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9.  Resulting system easier to use  User needs better accommodated  Resulting system has fewer features  Problems detected earlier  Design is of higher quality  Resulting system easier to maintain  Development incurs less effort 9

10.  Resulting systems has more features  Worse performance  Lesser quality design  Resulting systems harder to maintain  Prototyping approach requires experienced engineers 10

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12. 1. Good for situations where user requirements are unclear 2. Good where there is emphasis on user interface 3. User must be made aware of the costs of changes/additions and that proto’s are not products 4. Prototyping must be controlled, with explicit procedures and documentation 12

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