i have a query that how is the rationale about the as-built longest path, as i filtered the longest path in a as-built programme, it seems that some non-driving activities are shown too.

try these articles: //www.deco-dalles.com/?s=longest+path&post_types=post#search-special

i am looking for the blog and videos about this topic. but i don’t find it. could you please find it for me. thank you in advance.

no, not exactly. p6 doesn’t support the 3 estimates you would supply in a pert implementation.

i would like to know if pert is used in primavera.

thanks,
kath

asitha,
1. yes, i think fp 1 is likely less critical than say 5. but sometimes, if you examine total float, you’ll see the same values for activities on fp 1, fp 2 and fp 3 or similar. thus, p6 is trying to identify the many paths and most likely the past with the most activities will be listed first (not 100% verified).
2. yes, if it’s blank, it’s outside the range you selected.
great questions!

1. when you calculate multiple float paths (mfp) based on ff, does the least float path (fp) (say 1) represent the most critical from a ff standpoint ? an fp = 2 is less critical than an fp = 1 with regards to ff – is that the right understanding ?
2. what does a blank value for the fp mean; is it outside the range of 10 mfp’s you selected in the f9 screen
thanks again
asitha

hi jean,
i’m not familiar with the term driving critical path, but i do agree with the backwards method you describe. in fact, it sounds very much like what p6 does with it’s multiple float paths tool, where you can specify say a milestone and determine the driving relationship paths back from that activity. i will add it to the growing queue of topics to go deeper on.

thanks for the great tutorial. what are your thoughts on longest path vs driving critical path. driving critical path identified via a backward pass from the activity or milestone identified as your completion for the entire works or sectional works.

i am having allot of difficulty explaining this method to others who struggle to understand that this is the best way to identify the driving critical path.

lets have a workshop on the topic.

dear rafael,

realise this is an old post by now, but just curious to know, 10-11y ago, was that primavera v4 or v5?

so in the setup presented,

i.e. independent, concurrent activities competing for the same resource, with the important note that no leveling priorities are assigned (they are equal)

after scheduling (f9, assume with the option for “critical” defined as belonging to the lp, i believe the option has been there ever since p3ec)

and then levelling, or simply levelling (in one go, shift+f9, which i expect to produce no effect, human decision needed, software is clueless)

if you applied a “longest path” filter, you would get all activities filtered out?
instead of 4 equally long longest paths running in parallel, you got nothing?!

or that this is exactly what you got, but somehow expected some kind of levelling to occur regardless of missing input to prioritize?

appreciate a reply by you or whomever can remember that far back. thanks

kickoff meeting should not be a level of effort. perhaps a milestone.

any suggestion……

i stopped using p6 about 10 years ago and the longest path report for such simple schedule was empty. at the time it was incapable of showing not a single longest path for such schedule.

if you assign priorities other than changing the sequence, the longest path would consists of the same four activities, just a different order. my question is if p6 still discloses an empty report. if it shows no longest path then it is to expect more complex resource leveled schedule can be in error.

in p6 if you had 4 independent activities, each that allowed for a budget of 8 hrs/day, and only one resource available, that could only work to a max of 8hrs/day, the longest path would be 8 months. as there was not a leveling priority assigned to the activities, they would just start and finish in sequential order.

does that answer your question?

is it too much of a conundrum for p6?

hi rafael,
i’ve been looking at this comment for few days, but realize i’m not clear on the set up. you’re asking how p6 shows the longest path after leveling?

activity 1 , 2 months, 1 resource a
activity 2 , 2 months, 1 resource a
activity 3 , 2 months, 1 resource a
activity 4 , 2 months, 1 resource a

all activities are independent on each other and there are no logic links among activities.

there is only 1 unit of resource a available.

best regards,
rafael