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Note: In a practical software development project, the classical Waterfall Model is hard to use.

Interactive_model, also known as the Iterative Waterfall Model, is a Software Development Model that incorporates the necessary changes to the classical Waterfall Model to make it usable in practical software development projects. It is almost the same as the classical waterfall model except some changes are made to increase the efficiency of the software development.

The Iterative Waterfall Model provides feedback paths from every phase to its preceding phases, which is the main difference from the classical waterfall model.

Source: https://www.geeksforgeeks.org/software-engineering-iterative-waterfall-model/?ref=lbp