critical path analysis Flashcards
how are activity networks presented?
- acrs represent activities
- arc weights show the durations of the activities
- verticies represent events (moments between the completion of an activity and the start of another
- single start event (source) and single finish events (sink)
why are dummy activities needed?
- allows arcs to be uniquely labelled using the events at its ends
- establishing priority
what are the components of dummy activities?
- drawn with dashed lines
- have a 0 duration
try to use as less as possible
Draw the activity network
what is the minimum project completion time?
the time in which a project can be completed, assuming there are no unexpected delays
* length of the longest path in the directed activity network
what is a critcal acitivity?
an activity on the longest path
* between two critcal events
* difference between the two critcal events is the activity duration
what are the rules when completing the forward pass (earliest times) ?
first box
- choose the largest out of two possibilities (two paths incoming to a node )
- earliest time for the start event is 0
- earliest time to finsih is the minimum project completion time
what are the rules when completing a backwards pass (latest event time) ?
- choose the smallest out of two possibilities (two paths leaving a node )
- latest event time for the finish event is the project completion time
what is the critical path?
series of critical activities
what is a float?
total float
the amount of time by which the duration of the activity can be extended without having any effect on the minimum project completion time
what is an independent float and interfering float?
- independent float: unique to the activity
- interfering float: impacts the floats of the other activities
what are the formula’s for the floats?
Which activities are the critical activities?
how are cascade diagrams usually drawn?
time is boxes horizontally and letters are put vertically
put duration as a filled box and float in a dashed line
