Level of detail. Your scenario may include complex case materials and several pages of background data. But in general, the less detailed information you include, the easier it is for the players to improvise. Role plays require an element of conflict to maximize learning. You can create conflict by supplying different players with different information, by assigning incompatible personalities and attitudes, and by creating hidden agenda or mismatched goals.
Feedback is essential to learning.
You can provide structure with rating scales and observation checklists. You may assign one or more observers to evaluate specific aspects of the performance and provide impressions or data-based feedback. Number of players. Most role plays involve two characters interacting. Use a larger number of roles to represent real-world team processes.