Construction Sequence Analysis for Optimum Cost and Duration

CONSTRUCTION
SEQUENCE

Analysis of network on the basis of normal duration for activities
On looking at the network diagram above, the following path for completing the construction
project has been obtained.
A – E – F –D = 6 + 6 + 7 + 6 = 25 weeks
Cost = 12000 + 36000 + 10000 + 18000 = 76000
Indirect cost = 25 * 2300 = 57500
Total cost = 133500
A – E – I – C – D = 6 + 6 + 2 + 3 + 6 = 23 weeks
Cost = 12000 + 36000 + 20000 + 18000 + 18000 = 104000
Indirect cost = 23 * 2300 = 52900
Total cost = 156900
A – B – C – D = 6 + 8 + 3 + 6 = 23 weeks
Cost = 12000 + 24000 + 18000 + 18000 = 72000
Indirect cost = 23 * 2300 = 52900
Total cost = 124900
A – G – H – D = 6 + 5 + 8 + 6 = 25 weeks
Cost = 12000 + 20000 + 40000 + 18000 = 90000
Indirect cost = 25 * 2300 = 57500
Total cost = 147500
The cost and time schedule evaluated above indicates that the optimum cost and optimum time
of the project is 124900 and 23 weeks respectively.
However, as there are two critical paths due to having similar duration on two paths through
which project could be accomplished, therefore, the project crashing will be done as follows: