Conduct an evaluation of your system. Refer back to the spec for evaluation plan in the proposal, as well as what you wrote for this section in your rendition of the proposal. You may modify your evaluation plan based on feedback and changes in your design. Continue to consider the readings from Smith, Csikszentmihalyi, Hook & Sengers, and others. Again, the goal of evaluation is to establish (prove!?) that you have accomplished what you intended to. You may also wish to provoke experiences and critical thinking about experimentation through this process.
What are you measuring? How? What are the independent variables? That is, how are you changing the experimental conditions in order to create a comparison between two conditions. How are the goals of your project represented in your experiment design?
Be as clear and definite as possible.