I am currently working on a project and have been asked to submit a design rationale report that provides a coherent overview of the prototype design and reasons for choosing that design.

I'm looking for some examples where this has been communicated to clients before, as I'm quite new to the field.

Specifically, I'm looking for ideas around:

* Development of the prototype - what tool and why
* Clarifying the intended specification - how does the interaction unfold in relation to desired behaviour expected from the prototype. Also, if the prototype cannot do this due to trade-offs with budget, how could this be illustrated and communicated because user-research findings led to this?
* Examples of feedback sessions using the prototype, what expecting, guesses etc.