Small groups are called upon to make important policy decisions under a wide variety of procedural constraints. ACPE is a flexible, computerized system for conducting small-group voting experiments. It permits researchers to examine the impact of electronic communication on group deliberation and choice. The system runs under a variety of different personal computer networks and is designed to permit the specification of voting rules, communication, and group sizes. The system also facilitates the study of group process by tracking all messages sent and votes taken. An experiment in which the system was used is briefly described.