CASe exAMPle: geneRAl AvIATIOn hAngAR ReSTORATIOn I n t ro d u c t i o n this case example, although for a very small project, illustrates some interesting features of planning using critical path analysis. although there are only 17 activities, the precedence logic is a little complex to draw clearly owing to the number of crossed links, and we show how this difficulty is easily overcome by inserting dummy activities at three of the crossover points. our case example demonstrates the application of pert (program evaluation and review technique), in which the estimated duration for each activity can be subjected to a probabilistic study in an attempt to forecast the most likely completion time for the entire project. finally, this case will demonstrate how a project manager need not accept the results of time analysis without question, but can plan to apply extra effort to expedite critical activities (usually for additional cost) to bring the planned project completion date forward P ro j e c t B a c k g ro u n d CEN-CONSTRUCT is a medium-sized business located in Sydney, Australia that is owned and operated by a family. It is principally a consulting company that specializes in aviation civil engineering, having worked on runway construction and paving projects as well as several other airport airside projects, most of which have been for smaller general airports. Having decided to extend its range of operations, the company recognized a local need for a contractor that could carry out aircraft hangar renovation. In consequence, the company has now achieved a good level of expertise in the interior design and renovation of hangars the subject of this case example was the renovation of a hangar for a small client at a general aviation airport. the client uses the hangar to house his cessna 310 twin-engine plane. the hangar was originally built in 1950, since when no further construction or renovation work has been carried out. cen-construct had no previous integrated project management system or strategy for this type of project, so the project management planning steps described here were implemented for them. the planning exhibits are slightly simplified for clarity of reproduction. P ro j e c t D e f i n i t i o n A n d A c t i v i t y L i s t Because the total number of identified activities was small, a simple activity list (task list) sufficed for the WBS. This list, given in Figure 7.11, defines the project scope. It also defines the logical work sequence by stating the immediate predecessor(s) that must be completed before each new activity can begin. the cost estimates show that the total original estimated cost for this project was $46 900. Readers will note that the table in Figure 7.11 contains four different duration estimates for each activity. this is because the project planner decided to use a probability assessment method known as pert to this project. this is explained in the .