to dynamically assess incidents across all resources is to be effective

crowd management 

planning is the foundation to a successful outcome, but merely one component to build on for a safe completion.suitable and a sufficient number of trained staff, updates to any changes in venue design topography, underfoot conditions event running orders, misplaced structures/additions, artist profile, performers or challenges with sport fans, may all contradict the original plan, each having to be dynamically assessed and form a bigger picture and response strategy.

monitoring crowd behaviour, and having a clear understanding of the "the normal behaviour"of the crowd event, are important attributes to forming the appropriate response which prevents an adverse effect from the crowd. the current terrorism mo throws an additional complex issue into the mix, whereby an "incidents" development can be rapid reinforcing the need for effective monitoring, command and control and trained staff, if casualties are to be kept to the minimum.

an understanding of the crowd profile, recognition of the effects which a tangible or intangible  incident will have alcohol consumption, drugs, water conditions and unfamiliar evacuation routes should  always be taken into consideration as this may affect the judgement and rationale of a crowd during any localised or full evacuation or invacuation.