How groups are determined can influence the success of the project. There are a number of different ways to group and then manage the groups. Grouping can be done in a number of ways. Google forms allow a series of questions that can be filtered to group students. This also allows some input from the teacher to ensure that the groups will work.
There are a variety of activities and tools that can be used to monitor group performance. If used effectively these tools are able to monitor and define group roles and progress. As teachers in the PBL world we need to develop our range of tools instead of relying on the ones we are more comfortable with.
Time is also a factor in trying to use these tools. Do we embed them in our programs? Are they explicitly taught to students? How and when do we use them?