Due by Friday April 18: your project report. This should be written up in the style of a conference paper--title, authors, abstract, keywords, body, and references. Organize the paper body into the typical sections you would find in a conference paper, for example an introduction that sets up the problem, including any relevant related work (e.g., that we have talked about this semester, or that you find in the course of doing the project), a section describing your approach and rationale, a report of your findings (or your system if you design a system), and discussion or implications. Obviously there is no one right way to write up any project. I recommend that you use the examples of reports you've read this semester as models (e.g., the Chin et al. CHI97 paper, the LiveBoard paper). The paper length will clearly depend on the nature of the project, but I anticipate no less than 5-6 double-column ACM conference pages, and probably no more than 10-12.
As an Appendix to this paper, include your collaboration report, summarizing how your group coordinated its activities, how if at all roles were assigned and carried out, and what technology if any was used to support your collaboration. The format of this is entirely open; I intend it as an opportunity to reflect on your own collaborative experiences more than as a research or writing project in and of itself.