Critical path analysis may 2011 paper
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CRITICAL PATH ANALYSIS MAY 2011 PAPER. DETAILED STEP BY STEP ANSWER GUIDE. Calculating the total project time. Activity A Is an independent event. It takes 2 weeks. Activity B Must follow A. 2 + 2 = 4 weeks Activity C Must follow B. 4 + 5 = 9 weeks. Activity D Must follow B

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CRITICAL PATH ANALYSIS MAY 2011 PAPER

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Critical path analysis may 2011 paper

CRITICAL PATH ANALYSISMAY 2011 PAPER

DETAILED STEP BY STEP ANSWER GUIDE


Calculating the total project time

Calculating the total project time

Activity A

  • Is an independent event.

  • It takes 2 weeks.

    Activity B

  • Must follow A.

  • 2 + 2 = 4 weeks

    Activity C

  • Must follow B.

  • 4 + 5 = 9 weeks.

    Activity D

  • Must follow B

  • 4 + 7 = 11 weeks


Calculating the total project time1

Calculating the total project time

CRITICAL PATH CHECK

Activity E

  • Must follow C.

  • 9 + 4 = 13 weeks.

    Activity F

  • Must follow D.

  • 11 + 3 = 14 weeks.

    Activity G

  • Must follow E & F.

  • F is the longest.

  • So. 14 + 3 = 17 weeks.


Calculating the total project time2

Calculating the total project time

Activity H

  • must follow G.

  • 17 weeks + 2 = 19 weeks.

    Activity I

  • 19 weeks + 5 = 24 weeks.

Critical Path Check

Relationship between

Activity I & Activity H

Total Activity 1 = 24

Minus (duration) 5

= 19 weeks

Activity H is critical


What does 24 represent

What does 24 represent?

  • 24 represents the total project time.

  • It will be the final node in our network.

  • It will be the 9th activity & therefore 9th node.

  • Therefore our last node will look like:

24

24

9


How do i work out the critical path how do i work at the non critical paths

How do I work out the critical path?How do I work at the non-critical paths?

  • What activities must happen to reach node 9 (24 weeks)

  • We can identify the critical path by subtracting the duration from each activity, to see if it equals the previous activity.

  • The table on the next page summarizes the relationships.


Is there a missing node in our diagram

Is there a missing node in our diagram?

  • On the answer sheet, you will notice there appears to be an activity node missing

  • The node that appears missing is Activity E.

  • To understand, why this is the case, you must look at Activity G. Activity G is dependent on E & F.

  • As a general rule, whenever, the following event is dependent on two previous events, the two activities will be combined into one node.

  • Whatever, is the largest number will dominate.

  • Thus F, is clearly larger than E & being the critical path will dominate.

  • Therefore activity E, is actually not represented by itself.


Calculating the total float qii

Calculating the Total FloatQii

Calculate the total float on the network diagram & common ton its implications for New World

What is the total float?

This is the amount of a time a sequence of tasks can be delayed without having an impact on the whole process.


Critical paths total floats

Critical Paths & Total Floats

Very Important: Critical Path & Float

  • All activities on the critical path have 0 floats and there is no need for calculations.

  • Therefore only activities C & D, require a float calculation.


How do i calculate the total float

How do I calculate the total float?

Formula for Calculating the Total Float

  • LFT of the current activity

    (minus -) duration of the current activity

    (minus -) EST of the previous activity

    Activity C

    10 – 5 – 4 = 1 week

    Activity E

    14-4-9 = 1 week


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