Managing Operations: Week 6

  • Created by: EvemChas
  • Created on: 22-01-23 15:51

Project Planning: Part 1

Precedence Table 

  • Definition: 'A representation of ordering of elements which comprise total work content of product/service'.

Network Diagrams: Activity on Node convention (AoN)

  • Project broken down separate activities , represented nodes (boxes) diagram.
  • Flow activities left-right.
  • Arrows indicate precedence - not time.
  • Activities (nodes) identified label e.g. letters A-Z small project.

Start to End

If more 1 starting/ending activity, create new activity labelled Start/End 0 duration.

The Network and Paths

Network analysed number different paths from start end network.

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Project Planning: Part 2

The Critical Path

  • Path through network greatest duration.
  • Length whole project time complete path greatest total duration.
  • Activities critical path must started + completed time, otherwise completion project delayed.

Non-critical activities + Float

  • Activities which not critical path = non-critical.
  • Float any activiity amount time by which duration could extended point where would become critical.
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Project Planning: Part 3

Calculating Early Start Time + Early Finish Time (Forward Pass)

  • EST starting activity = 0
  • Move forward through network (left-right)
  • EFT activity = EST + Duration
  • EST activities after starting activity set EFT preceding activity
  • If 2/+ preceding activities, take highest EFT value 

1. FORWARD PASS (Left-right)

  • Place numbers along top activity
  • Add up durations
  • Choose highest answer at junction
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Project Planning: Part 4

Calculating Late Start Time and Late Finish Time (Backward Pass)

  • Move backward through network (right-left)
  • LST activity = LFT - Duration
  • LFT activities after starting activity set LST, following activity. 
  • If 2/+ following activities, take lowest LST value.

2. Backward Pass (Right-left)

  • Place numbers along bottom activity.
  • Subtract durations.
  • Choose lowest answer junction.
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