From the website:
Choicebooks and Workbooks: are to online engagement what the conversation guide is to in-person conversations: a critical enabler of informed participation. Choicebooks allow participants to place themselves in the shoes of decision-makers, and as the name implies, make tough choices. To this end, they provide balanced information on the issue(s) at hand, outlining benefits, drawbacks and tradeoffs associated with various approaches or options. Scenarios may also be used to illustrate the choices faced by decision-makers. Workbooks, by contrast, focus on providing relevant context information and facts to facilitate issue exploration, allowing participants to familiarize themselves with an issue by “working through it”.
In both cases, participants are invited to review the background material provided and share their views by responding to a mix of close-ended and open-ended questions. These guides are often prerequisites for participating in other online engagement activities, since they provide a common baseline of information to all participants.
Choicebook is developed by Ascentum based in Ottawa, Ontario (Canada).
Update: Ascentum has been acquired by Hill & Knowlton Strategies, and Choicebook has been discontinued. In order to access the site, view an archived copy.