Accountability

How do I ensure accoountablity when students are working in groups?
 * Concerns || Solutions ||
 * Will each member work equally? || Assign a task for each member ||
 * Will members treat each other with respect? || Group checklist for respect ||
 * How will the groups be established? || google apps./teacher approved ||
 * Will they be done within time frame? || break up project/assignment into smaller incements with due dates ||