The disadvantage of this approach is that it is substantially more difficult logistically and it diminishes the opportunity for people from different groups to gain an understanding of one another's role and approach to problems. In those exercises where certain participants, notably law enforcement, joined the scenarios at different stages, the feedback was generally critical, and participants felt that staging participation diminished learning and teambuilding opportunities. Another solution is to split exercise participants into two or more groups that allow everyone to participate, often placing people at similar levels of responsibility in the same group, and to conclude the exercise with a session that brings everyone together to share what they learned.