Chapter 7 will discuss using the architecture as a basis for incremental development: starting small and growing the system but having a working subset at all times. Propose the smallest subset of the A-7E software that still does something (correctly, in accordance with requirements) observable by the pilot. (A good candidate is displaying a value, such as current heading on some cockpit display.) Which modules do you need and which can you do without? Now propose three incremental additions to that subset and specify the development plan (i.e., which modules you need) for those.