Chapter Ten – Project Scheduling: Lagging, Crashing, and Activity Networks

Discussion Questions 2, 3, 5

Chapter 10: Additional Study Notes

(Excerpts from the original Pinto PowerPoint Presentations)

Gantt Charts 

  • Establish a time-phased network
  • Can be used as a tracking tool

Benefits of Gantt charts 

  • Easy to create and comprehend
  • Identify the schedule baseline network
  • Allow for updating and control
  • Identify resource needs

Crashing 

The process of accelerating a project

Principal methods for crashing 

  • Improving existing resources’ productivity
  • Changing work methods
  • Increasing the quantity of resources

Managerial Considerations 

  • Determine activity fixed and variable costs
  • The crash point is the fully expedited activity
  • Optimize time-cost tradeoffs
  • Shorten activities on the critical path
  • Cease crashing when – the target completion time is reached – the crashing cost exceeds the penalty cost

Controversies in the Use of Networks 

  • Networks can be too complex
  • Poor network construction creates problems v Networks may be used inappropriately
  • When employing subcontractors
    • – The master network must be available to them
    • – All sub-networks must use common methods
  • Positive bias exists in PERT networksChapter 10: Additional Study Notes

(Excerpts from the original Pinto PowerPoint Presentations)

Gantt Charts 

  • Establish a time-phased network
  • Can be used as a tracking tool

Benefits of Gantt charts 

  • Easy to create and comprehend
  • Identify the schedule baseline network
  • Allow for updating and control
  • Identify resource needs

Crashing 

The process of accelerating a project

Principal methods for crashing 

  • Improving existing resources’ productivity
  • Changing work methods
  • Increasing the quantity of resources

Managerial Considerations 

  • Determine activity fixed and variable costs
  • The crash point is the fully expedited activity
  • Optimize time-cost tradeoffs
  • Shorten activities on the critical path
  • Cease crashing when – the target completion time is reached – the crashing cost exceeds the penalty cost

Discussion Questions 2, 3, 5 (from the textbook)

Questions:

Question- The advantage of Gantt chart lies in their linkage through the project schedule baseline. Explain this concept.

Question – What are the advantages in the use of Ganett charts over PERT diagrams? In what ways might PERT diagrams be advantageous?

Question -Under what circumstances might you wish to crash a project?

 

Controversies in the Use of Networks 

  • Networks can be too complex
  • Poor network construction creates problems v Networks may be used inappropriately
  • When employing subcontractors
    • – The master network must be available to them
    • – All sub-networks must use common methods
  • Positive bias exists in PERT networks
 
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