I'm developing a game for my dissertation, and I'm using the spiral method approach.

I'm having a bit of difficulty structuring my dissertation, specifically the design and implementation section.

My solution was designed as much as possible initially, and then after each prototype implementation, the design was refined and extended and prototyped again (this was repeated a few times).

My problem is how to structure this in my dissertation, my current idea is:

• Design Chapter
  • Prototype 1 (Initial) Design
  • Prototype 2 Design
  • Prototype 3 Design
• Implementation Chapter
  • Prototype 1 (Initial) Implementation
  • Prototype 2 Implementation
  • Prototype 3 Implementation

Any suggestions?