CIVL202 Construction Engineering I

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CIVL202Construction Engineering I

• Tutorial 9
• T1 Mon 1100 1150
• T2 Wed 0900 0950

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Tutorial Outline

• Parameters and algorithm of CPM
• A sample about AON

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Parameters of CPM
EST(I) early start time of activity I EFT(I)
early finish time of activity I LST(I) late
start time of activity I EST(I) late finish
time of activity I
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Algorithm of CPM

• Forward-pass algorithm

EFT(I) EST(I) DUR(I)
(1)
(2)
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Algorithm of CPM

• Backward-pass algorithm

LST(J) LFT(J) - DUR(J)
(1)
(2)
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Example about AON
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Float

• Float The amount by which an activity can be
  delayed without delaying the total project is
  called float.

Four types of float

• Total Float
• Free Float
• Interfering Float
• Independent Float

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Total float

• Total float
• The total, or maximum, number of time units that
  an activity can be delayed without increasing the
  total project duration.

TF(I) LFT(I) EFT(I)
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Free float

• Free Float
• The amount of time an activity can be delayed
  without impacting activities that follow it.

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• Interfering Float
• The amount of the total float utilized that
  interferes with the following activities.

IF(I) TF(I) FF(I)
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