Lags are waiting time (or delays) between 2 activities, for instance, you paint a wall, and before hanging some frames at the wall, you wait 24 hours until the wall is dry (a lag of 24 hours between a finish to start relationship).
A lead is like a "negative" time, it speeds up an activity without changing the relationship of these activities, if both activities can be executed partially in parallel. For instance, the same example as above, you use a paint that dries faster, so you paint two walls, and after the second wall, you hang the frames at the first one, then you paint the third wall, and you hang the frames on the second one, and so on.
Leads obviously increases risk and may cause rework (the wall was not really dry and you removed wet paint, and had to repaint it)
saket_pmp
Wed, 07/04/2012 - 06:20
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Lead and lag
Lags are waiting time (or delays) between 2 activities, for instance, you paint a wall, and before hanging some frames at the wall, you wait 24 hours until the wall is dry (a lag of 24 hours between a finish to start relationship).
A lead is like a "negative" time, it speeds up an activity without changing the relationship of these activities, if both activities can be executed partially in parallel. For instance, the same example as above, you use a paint that dries faster, so you paint two walls, and after the second wall, you hang the frames at the first one, then you paint the third wall, and you hang the frames on the second one, and so on.
Leads obviously increases risk and may cause rework (the wall was not really dry and you removed wet paint, and had to repaint it)
Saket, PMP