Critical Path Analysis If you have to draw an activity network from a precedence table all arcs must have arrows, in the right directions. Additional dummies lose the final accuracy mark. If it tells you the network has two dummies but you draw a network with no dummies you lose all marks. You need to draw at least one dummy. 2. If the Question is ‘explain why each of the dummies is necessary’ The correct answers are ‘A and B must be able to be described uniquely in terms of the events at each end’ ‘I depends on D only but J depends on D and G’ (use ‘event D’ here instead of ‘activity D’ is 0 marks) All boxes must be completed. Miss a number out and lose all marks. We check your top numbers are generally increasing left to right (and vice versa for bottom)