In the earlier waterfall model, software architects were heavily involved upfront and their participation and hence authority decreased once the original application was delivered.

The model’s inherently inflexible and non-iterative form make it worthy of note, but unpopular for most modern software engineering application development environments.

The Agile software model is flexible, iterative and responsive to change. In contrast, Waterfall has a very rigid structure. The Waterfall framework Waterfall defines several specific phases in ...

This is especially difficult for teams that are used to a waterfall model, where technical design and architectural implementation are the very first steps after the specification is written.