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# Lecture Network Analysis

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Lecture Network Analysis
Project Management Lecture Network Analysis

Plan Introduction Project planning Project planning Risk management
Network analysis I Network analysis II Introduction Project planning Gantt chart and WBS Network analysis I Network analysis II Project planning Resource analysis Risk management Quality Budgets and cost control Project teams

Why Network Diagrams? Splits up the decision making process into
Method/logic - the order in which tasks have to be completed Time – estimates for the time to completion can be added to each task Resources – these can be added and then analysis carried out

Project Exercise 1

Project Exercise 1

Why Network Diagrams? Splits up the decision making process into
Method/logic - the order in which tasks have to be completed Time – estimates for the time to completion can be added to each task Resources – these can be added and then analysis carried out

Two Parts to the Analysis
Forward Pass Calculates the Duration of the Project Backward Pass Calculates the slack/float for each task and shows the critical path

Forward Pass In a game of rugby it is a means of cheating often missed by referees (BBC, 2005)

Forward Pass …but in project management it is used
To calculate the total duration of the Project… For each task: Take the earliest start time (EST) Calculate the Earliest finish time (EFT): EFT = EST+Duration

What’s in the box? Earliest Start Estimated Duration Earliest Finish
Activity Number Activity Description Latest Start Float Latest Finish Earliest Start Estimated Duration Earliest Finish Activity Number Activity Description Latest Start Float Latest Finish Earliest Start Estimated Duration Earliest Finish Activity Number Activity Description Latest Start Float Latest Finish

Forward Pass

Forward Pass

Project Exercise 1

Exercise 1 – Forward Pass
Carry out a forward pass on Project in Exercise 1

Project Exercise 1

Project Exercise 1 Dangler Dangler Dangler

Start and Finish Nodes

What’s in the box? Earliest Start Estimated Duration Earliest Finish
Activity Number Activity Description Latest Start Float Latest Finish Earliest Start Estimated Duration Earliest Finish Activity Number Activity Description Latest Start Float Latest Finish Earliest Start Estimated Duration Earliest Finish Activity Number Activity Description Latest Start Float Latest Finish

Backward Pass To calculate the float for each task? For each task:
Take the latest start time (LST) Calculate the latest finish time (LFT): LST = LFT-Duration

Backward Pass

Backward Pass

Project Exercise 1

Exercise 1 – Backward Pass
Carry out a backward pass on project exercise 1

Ex1 - After Backward Pass

What about the float? Float = LFT-EFT Or Float = LST-EST

What about the float? Float represents the amount of time that the task can be delayed without affecting the outcome of the project A task with zero float cannot be delayed and is therefore critical to the timely completion of the project

What about the float? A time optimised project will have a sequence of tasks from start to finish that have zero float This sequence of tasks is called the critical path

Project Exercise 1

Exercise 1 – Critical Path
Calculate the float for each task and identify the critical path through the project

Ex1 – Float

Ex1 – Critical Path

Questions My Project has no critical path. What does this mean?
My programmer has broken his big toe in a skiing accident and cannot type for two weeks (he has a valid sick note). How will this affect my software delivery date?

Directed Study Find the critical path for Project Exercise 2 (see Lecture 3). Find the critical path for the large project in Exercise 3.

Plan Project planning Introduction Project planning Project planning
Network analysis I Network analysis II Introduction Project planning Gantt chart and WBS Network analysis I Network analysis II Project planning Resource analysis Risk management Quality Budgets and cost control Project teams Project planning Resource analysis Risk management Quality Budgets and cost control Project teams

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