June 2006
Beginner
793 pages
20h 59m
English
Content preview from Quantitative Techniques: Theory and Problems
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HEAD EVENT SLACK (HES)
The head event slack of an activity in a network is the slack at the head (or terminal point) of an activity. In other words, head event slack of an activity in a network is the difference between the latest event time and earliest event time at its head (or terminal point or node). It may be noted that HES should be calculated with the help of network after calculating Earliest Time (E) and Latest Time (L).
Example I –
For the above network, HES of various activities are computed as under:
| Activity | HES = L– E at head (or terminal point or node) |
| 1-2 | 9 – 2 = 7 |
| 1-3 | 4 – 4 = 0 |
| 1-4 | 12 – 3 = 9 |
| 2-5 | 10 – 10 = 0 ... |
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