Which schedule development tool and technique produces a theoretical early start date late start date?
A.
Critical Path method
B.
Variance analysis
C.
Schedule comprenssion
D.
Schedule Comparison bar chart
Explanation:
Critical Path Method (CPM):
The Critical Path Method (CPM) is a schedule network analysis technique. CPM was developed by the DuPont Corporation in 1957.Critical path determines the shortest time to complete the project and it is the longest duration path through a network of tasks. Critical tasks (activities) are tasks (activities) on the critical path.
To understand CPM further let’s first understand nature of the task. According to PMBOK every scheduled task can be defined by the following four parameters.Early Start (ES): Earliest possible point in time on which a task can start.
Early Finish (EF): Earliest possible point in time on which a task can finish.
Late Start (ES): Latest possible point in time on which a task can start.
Late Finish (EF): Latest possible point in time on which a task can finish.Early Start and finish dates are calculated by means of Forward Pass and Late Start and Late Finish dates are calculated by means of Backward Pass. Many Tasks have some amount of buffer added to them referred as Slack Time or Float. Float time is amount of time a task can slip before it delays project schedule. There are two common types of
floats.Free Float: Amount of time a single task can be delayed without delaying the early start of any successor task.
Total Float: Amount of time a single task can be delayed without delaying project completion.Mathematically Float is defined as: Float = LS – ES or LF – EF.
Critical path has zero or negative Total Float. A project can have several critical paths