Project Management the First Activity

Project Management The first activity scheduled is activity 2, because it has the minimum slack. Then activity 1 is scheduled. Activity 3 is delayed one period, which reduces slack to zero. From this, activity 5 will also be delayed one period, reducing slack to zero. The remainder of the activities will be scheduled in order, subject to delays. Therefore, the order in which the activities are scheduled is now 2,1,3,4,5,6. The activities that are critical are those in which there is the least, or negative, slack. The critical activities therefore are 2,3,5,6.

The slack for activity 1 is now 0. The slack for activity 4 is now 2. The slack for activity 5 is now 0.

Period Activity Changes 0-1 Schedule Activity 2 as per minimum slack rule 0-1 Schedule Activity 1 0-1 Delay activity 3 ES to period 1, reduce slack to 0 0-1 Delay activity 5 ES to period 6, reduce slack to 0 1-2 Delay activity 3 ES to period 2, reduce slack to -1 1-2 Delay activity 5 ES to period 7, reduce slack to -1 1-2 Delay activity 6 ES to period 11, reduce slack to -1 2-3 Delay activity 3 ES to period 3, reduce slack to -2 2-3 Delay activity 5 ES to period 8, reduce slack to -2 2-3 Delay activity 6 ES to period 12, reduce slack to -2 3-4 Schedule activity 3 4-5 Schedule activity 4 5-6 No changes 6-7 No changes 7-8 No changes 8-9 5 Schedule activity 5 9-10 No changes 10-11 No changes 11-12 No changes 12-13 6 Schedule activity 6 ID Res Dur ES LF SL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 0 4 1 2 2 2 2 1 4 0 4 0 1 1 1 1 3 1 5 0,1,2,3 6 1,0,-1,-2 X X X 1 1 1 1 1 4 1 6 4 10 0 1 1 1 1 1 1 5 2 4 5,6,7,8 10 1,0,-1,- 2 nx x2 2 2 2 6 2 3 10,11,12 13 0,-1,- 2 nx2 2 2 3 3 2 2 2 2 2 2 3 3 2 2 2 2 2 RA 3 3.