As long as the client is accepting of time-T-for-feature-F, I quite like this mode of development. Whatever is built shows value at every step. As long as a sui

As long as the client is accepting of time-T-for-feature-F, I quite like this mode of development. Whatever is built shows value at every step. As long as a suitable programming language is used to allow for the changing executing environment (in your example: a GUI).