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Transcript of Case study
- Project-type activities are in and of themselves nothing new; indeed, they recently has this type of activity been recognized as an operations management problem of great significance
Operations management problem
: project contains eight separately identifiable steps or activities and that estimates of the requirements of each activity have been obtained as follows
NETWORK ANALYSIS: AN EXAMPLE
POSSIBLE SULUTIONS FOR ILLUSTRATIVE
TIME/COST TRADE-OFF PROBLEM
NETWORK DIAGRAM WITH EARLY AND LATE TIMES, CRITICAL PATH, AND ACTIVITY TOTAL SLACK (TS)
INSTRUCTION NOTE-NETWORK PLANNING/SCHEDULING TECHNIQUES FOR PROJECT MANAGEMENT
CRITICAL PATH ANALYSIS
: All project activities can be accelerated by allocating more resources at the expense of higher activity direct cost.
TIME/COST TRADE-OFF PROCEDURES
The backward pass calculations
EST : Early Start Time
EFT : Early Finish Time
LST : Late Start Time
LFT : Late Finish Time
TS : Total Slack
- This recognition came about primarily as a result of post-World War II emphasis in the United States
A: Design production tooling (3 weeks)
B: Prepare manufacturing drawings (2 weeks)
C: Prepare production facility to receive
new tooling and parts (5 weeks)
D: Procure tooling (7 weeks)
E: Procure production parts (4 weeks)
F: Crib parts (1 week)
G: Install tools (2 weeks)
H: Test (1 week)
ROUGH ARROW DIAGRAM OF SAMPLE PROJECT
ACTIVITY-ON-NODE DIAGRAM OF SAME PROJECT
ILLUSTRATIVE PROJECT WITH TIME/COST TRADE-OFF DATA
Activity can be performed at different durations ranging for an upper “normal” value, at some associated “normal” cost, down to a lower, “crash” value, with an associated higher cost
PROJECT TIME/COST TRADE-OFF CURVES
The objective of the forward pass calculation is to determine the so-called early start time (EST) and early finish time (EFT) of each activity. Interpreting these terms is easier if we take zero as an arbitrary starting time for the project. Then, measuring from time zero, the early start time of each activity is the earliest possible start at their.
: The objective of this new pass is to determine the so-called late start time (LST) and late finish time (LET) of each activity. These times are interpreted as the latest possible time at which an activity can start or finish without delaying the project
: Activity total slack is defined as the maximum amount if time that an activity can be delayed without delaying project completion time
TS = LST-EST = LFT-EFT
Total Slack (TS)
: Free slack for an activity never exceeds the total slack for the activity; it is calculated as the difference between EFT for that activity and the earliest of the EST values of all its immediate followers
: Two important points are notable about time/cost procedures. First, resource limitations are usually not considered explicitly