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 ... |
Get Quantitative Techniques: Theory and Problems now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
