New manager foundations workshops are capped at 12 participants. We find that beyond 12, facilitators can't give meaningful individual feedback during role-play exercises. Senior leadership intensives are smaller still, typically 6 to 10 people, because the discussions involve sensitive organisational data and need more airtime per person.
If you have a larger cohort, we run back-to-back sessions rather than inflating group size. Two groups of 10 learn more than one group of 20.