#1
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Lots of S's and F's Lets say we are digging a trench and laying pipes into that trench. Logic has it, we can't start laying the pipes until the trench is dug, ergo Start-to-Start. However, can't we achieve the same result with simply creating a constraint on the pipe laying activity as Finish-to-Start with a lead? So why would we even need an SS relationship apart from having a nicely rounded off permutation of letter combinations i.e. FF, FS, SF and SS? |
#2
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Management likes to see summary level schedules where work is represented by as few bars / tasks as possible. It gives them a quick idea of where they stand. However, a rigorous CPM schedule for field execution would ideally have a greater degree of detail. Instead of one long task for "dig trench", you could segment the work into several smaller tasks: dig trench 40 feet (section 1) dig trench 40 feet (section 2) dig trench 40 feet (section 3) etc. and similarly, segment the pipe laying: lay pipe section 1 lay pipe section 2 lay pipe section 3 etc. Now it is easy to schedule the tasks with FS relationships. Additionally, with a greater degree of detail, progress updates can be more accurate/reliable as there is less guesswork on percent complete for a given task in the schedule.
__________________ "I love it when a plan comes together." - Colonel John "Hannibal" Smith, A-Team |
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