Critical Path Example: Preparing for an interview.

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Presentation transcript:

Critical Path Example: Preparing for an interview

Complete the precedence table Activity duration Shower3 Dry hair8 Fetch car7 Iron clothes12 Dress and make-up10 Drive to interview20

Precedence table Activity Immediately preceding activities duration AShower-3 BDry hairA8 CFetch car-7 DIron clothes-12 EDress and make-upB,D10 FDrive to interviewC,E20 The last activities that must be completed before an activity can begin

Draw Shadow Diagram AA BB CC DD EE FF

Shadow Diagram AA BB CC DD EE FF

Draw the network A E B C D FFinish Start

Activity Times Start F 20 E 10 B 8 A 3 D 12 C 7

Forward Pass Start F E B A D 12 0 C Minimum Time: 42 minutes

Forward Pass Start F E B A D 12 0 C Minimum Time: 42 minutes- Does this make sense?

Forward Pass Start F E B A D 12 0 C Minimum Time: 42 minutes- Unless someone else does the ironing and fetches the car, you need to do everything and hence the minimum time would be 60 minutes.

Backward Pass Start F E B A D 12 0 C

Backward Pass Start F E B A D 12 0 C Critical Path: D-E-F

Gantt Diagram – not realistic

More realistic if someone else irons and fetches the car (C and D) Critical Path would be A, B, E, F