Critical Path Analysis

Question 1

What is a critical path analysis

Answer 1

•A critical path analysis is created to plan all of the tasks of a project in the right order

•Each task will have an EST (earliest start time) and a LFT (latest finish time)

•CPA will identify tasks which can be completed at the same time, float time and critical activities to complete the project on time

Question 2

Float time formula

Answer 2

LFT at the end of the activity – EST at the start of the activity – Duration of the activity

Question 3

Identifying the sequence for the critical path

Answer 3

Critical path is the longest route through the network – delays in these tasks will lengthen the project time

•The critical path is also where the EST and LFT match in the node

•It is critical to complete these tasks on time!

Question 4

Advantages

Answer 4

Critical activities can be identified.

Allows effective management of resources, allocating factors, such as labour, to where they needed and can be most effective.

Problems can be highlighted early so that whole projects aren’t delayed.

Improves overall management of projects- managers understand what is involved and what needs to be done.

Question 5

Disadvantages

Answer 5

Information can be distorted or poor methods of (over optimistic) estimation of activity times can be used.

CPA can give the wrong results, or fail to allow for external factors that will influence the total time taken.

Sub-contractors, who may be completing some of the activities on a project, can be outside the control of the project manager.

Supplies may be delayed; they may be of the wrong type or of poor quality.