Activity Existence Making project activities disappear on cue. Aircraft Heavy Maintenance Organising a maintenance schedule based on resources and short and long term requirements. Cost vs Time Managing the tradeoff in a project between cost and time. Flow In Duct Equation switching based on flow regime. Wing Strut An engineering component that has to design itself out of existence as the performance envelope changes - why parametric design doesn't get you very far. Visualisation Tools The tools used to view, handle and manipulate knowledge structures