SDI1 week6_1

03/03/2010


 
Project Schedule

Terminology

• Precedence
  
• Concurrence
  
• Leads & Lag time
  
• Milestones
  

 

Scheduling Techniques

• 
  
  Mathematical Analysis
  
  • Network Diagram
    
• 
  
  Bar Chart
  
  
  

Network Diagram

• 
  
  Activity on Arrow Network
  
  • Event is binary
    
  • Activity can be partially complete
    
• 
  
  Activity on Node Network
  • Events are shown in activity on node network unless they are milestones
    
  • Milestones are points in the project at which major portions of the work are completed
    

 

Reason for scheduling

• Ensuring that the deadline can be met
  
• 
  
  How the project should be managed
  
  
  

Critical Path

• Def: the series of activities that determines the duration of the project
  
• All project have a critical path
  
• 
  
  Critical path must do
  
  
  

PERT (Program Evaluation and Review Technique)

• Based on idea that estimates are uncertain
  
• 
  
  Uses an "expected value"
  
  
  How to estimate
  
  
  Optimistic (ex. 5Weeeks)
  
  Most likely (ex. 7weeks)
  
  Pessimistic (ex. 10weeks)
  
  
  
  PERT Formula
  
  
  te = ( a + 4m + b ) / 6
  

te	expected time
a	optimistic time estimate
m	most likely time estimate
b	pessimistic time estimate

 

ex. (5w + 4*7w + 10w) / 6 = 7.16w