Does the facilitator of a scenario development activity need substantive knowledge of the focal topic?

In this short paper, we provide guidelines for the facilitation of scenario thinking interventions in organizations. Our focus is on common situations where the scenario development facilitator has little or no knowledge of the substantive topic of the scenarios. Should the facilitator avoid such situations? Should he/she spend time reading around the topic area? Or, is little or no preparation a sensible starting point to achieve a strong subsequent set of scenarios? The paper deals with two settings for scenario interventions: i) interventions within a single organisation, and ii) interventions in a multi-agency context.