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The Evolutionary Process Model is a software development model in which the system is developed progressively through repeated iterations, allowing the software to evolve over time based on user feedback and changing requirements. Instead of delivering the complete system at once, the software is built in increments or versions, and each iteration produces a working version of the product. As development proceeds, requirements are continuously refined, and improvements are made in every new version, ensuring that the system gradually becomes more complete and reliable.

In this model, there is strong user involvement throughout the development process. Users interact with each version of the software and provide feedback, which helps developers understand expectations more clearly and make necessary adjustments. The Evolutionary Process Model is particularly useful when customer needs are mostly clear but may require small modifications during development, or when the technology being used is new and requires time to learn. Since development and refinement happen simultaneously, the model involves higher risk, but this risk is managed through continuous evaluation and reporting to the customer.

Overall, the Evolutionary Process Model supports flexibility, early delivery, and continuous improvement. It is well suited for complex and risk-intensive projects where learning, experimentation, and gradual refinement are essential. However, it may lead to challenges such as less predictable schedules, increased management effort, and documentation difficulties. Despite these limitations, the Evolutionary Process Model is effective in producing software that closely aligns with user needs and adapts well to change.