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Reducing Project Duration - Coggle Diagram
Reducing Project Duration
Rationale for Reducing Project Duration
Time Is Money: Cost-Time Tradeoffs
Reducing the time of a critical activity usually incurs additional direct costs.
Reasons for imposed project duration dates:
Incentive contracts (bonuses for early completion)
Imposed deadlines and contract commitments
Overhead and public good
Unforeseen delays
Time-to-market pressures
Pressure to move resources to other projects
Explanation of ★Project Costs★
Project ★Indirect Costs★
Costs that cannot be associated with any particular work package or project activity
Costs that vary (increase) with time
Project ★Direct Costs★
Normal costs that can be assigned directly to a specific work package or project activity
Crashing activities increases direct costs.
Constructing a ★Project Cost–Duration Graph★
Find total indirect costs for selected project durations
Sum direct and indirect costs for these selected project durations
Find total direct costs for selected project durations
Compare additional cost alternatives for benefits
Determining Activities to Shorten
Shorten the activities with the smallest increase in cost per unit of time
Assumptions
The cost-time relationship is linear.
Normal time assumes low-cost, efficient methods to complete the activity.
★Crash time★ represents a limit—the greatest time reduction possible under realistic conditions.
Slope represents a constant cost per unit of time.
All accelerations must occur within the normal and crash times.
將活動縮短，稱為★趕工縮程(crashing)★
★趕工縮程點(crash point)★表示一個活動可被縮減的最大時間值
Options for Accelerating Project Completion
Resources Not Constrained
Scheduling overtime
★Outsourcing★ project work
Establishing a core project team
Adding resources
Do it twice—fast and then correctly
Resources Constrained
Critical-chain
Reducing project scope
★Fast-tracking★
Compromise quality
Improving project team efficiency