ISBN : 978-81-963532-2-3 (E-Book) A prototype of the actual product is preferred in situations such as: • User requirements are not complete • Technical issues are not clear Fig 3.2: Prototype Model 4. EVOLUTIONARY MODEL It is also called successive versions model or incremental model. At first, a simple working model is built. Subsequently it undergoes functional improvements & we keep on adding new functions till the desired system is built. Applications: • Large projects where you can easily find modules for incremental implementation. Often used when the customer wants to start using the core features rather than waiting for the full software. • Also used in object oriented software development because the system can be 16 Software Engineering Keerthana P, Manasa KN, Ganga D Bengal
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