This has some implications, both for groups being too small and too large.

Smaller sessions; create a more intimate group dynamic, but also limits the scope for new ideas, knowledge and experiences. Participants work harder but also have more of questions answered.

Larger Sessions; The largest sessions we generally like are around 20 people. The exception here is when we have highly experiential activities where we might have over a hundred people working on adventures. For these we increase our number of people who help run the session, ensuring good learning outcomes.

Leadership training; In our experience, groups over 14 have less impact. There is less personal interaction, and hence people reflect on their own situation more internally, which does not open up opportunities for guidance.