Question

CPM -5% A Subcontractor must do the following: a) Framing (5 days) b) Drywall Installation (4 days) c) Drywall finish and paint (3 days) Assuming he wants to make sure each activity finishes at least 1 day after its predecessor has finished, draw these three activities in a precedence diagram (logic network) and calculate how much time the subcontractor would need to finish all three activities Scheduling Basics-Copyright 2013 Bill Morales

Answer 1

first activity should be framing and one can not start draywall installation without completing framing work.the next task is finishing and painting. we can carry both installtion and finishing and painting as parallel task by giving one day or two day break for the last event to ensure some part of the preceding activity will be completed so that the next task can be started

the above shown logical network is built by CPM method of project planning.

start) days framing B 4 days Drymour installation ing days work 3 days (finishing and painting of Dry wall)

in the above network 2 days have been left with no work to ensure some part of installation of drywall to be completed to carry finishing works and also to satisfy the given condition "each activity should be finished atleast 1 day after finishing of its predecessor activity".

in the above network critical path has been shown with black line.the network is telling that after framing activity, installation, finishing amd painting of the drywall are carried as parallel activities to reduce project duration.

Therefore from the above network the total project duration is 10 days.(critical path duration)