Tips on using this forum..

(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?

(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.

Why critical activities not same longets path activities?

3 replies [Last post]
hanson California
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 9 Jan 2012
Posts: 116

Dear Planners,

 

I have schedule 7000 activities our clints working on with critical activities 850 and longest path only 5 ... why they are not equal or close to geather?

 

Thank you,

Replies

hanson California
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 9 Jan 2012
Posts: 116

Rafael and Gary thanks a lot and really I appreciate you help. May GOD bless you both...

Gary Whitehead
User offline. Last seen 15 weeks 1 day ago. Offline

Hanson,

This is probably due to either OOS working, or constraints. -both of these can reduce an activities float to the point of becoming critical without it being on the longest path.

Rafael Davila
User offline. Last seen 1 hour 10 min ago. Offline
Joined: 1 Mar 2004
Posts: 4780

Longest path is frequently different to true critical activities because it cannot handle multiple date constraints nor resource leveling.

If you are interested on identifying activities that are not critical at any specific moment but with high probability of becoming critical you shall look at statistical modeling.

Traditional definition of critical activities is, activities with no available float, that if delayed would delay the job finish date or any contractual milestone.

I believe it is mathematically correct but unfortunately some people that cannot accept critical paths can be multiple under multiple contractual delivery milestones or that these paths can be just segments still insist on the ancient theory of critical path being a single path, continuous from job start to job finish, a wrong mathematical assumption under resource leveling and multiple contractual constraints.

To make it worst, they create flawed theories about criticality, and go as far as including those flawed theories on forensic practice. Statistical methods usually will identify activities on the longest path with a high probability of becoming critical, but being critical or near critical is a different thing, usually close but not the same.

Would you say someone killed me because the bullet was close, even if the bullet did not touch me and I am still alive?