The module stressed that it is best to avoid reassigning group members. This has often been problematic for me since in my courses the groups are set up the first class session and in the following sessions due to drops/withdrawals/absences some groups are drastically reduced, not only permanently but unpredictably from one session to the next (and because of absences, differing groups are affected in different sessions). Maintaining any kind of positive group dynamic becomes a real challenge. What are some effective techniques for dealing with this problem?