First cluster contains the aspects of operations that are obvious to the attendee. They are the on-site operations. Second cluster are the aspects of event that may be classified under the term project operation management . These are such things as reports and control mechanisms, Software systems, work and resource allocation, communication system. They will not be obvious to the attendees and will only be known to some to the staff.
Third cluster contains the environment in which the event operations exist.
This includes the risk management, corporate culture, organisational structure. These will impact on the whole event operations. It will also include the interface of the operations with the event marketing, overall event organisation and the stakeholders. To simplify the three clusters one can imagine them as a three concentric spheres as shown above. They are a consequence of the management system used in the middle sphere and both these spheres operate under the constraints of the outer sphere.