critical chain project management & theory of constraints
TRANSCRIPT
Critical Chain Project Management & Theory of ConstraintsA QUICK SNAPSHOT
Traditional Critical Path Method
Student syndrome – Start the work at last possible moment. Parkinson’s law – Work expands so as to fill the time available for its
completion. Bad Multitasking – Result of poor prioritization.
In tradition critical path project management, 30-40% time & resources are wasted due to bad multitasking, student syndrome & Parkinson’s law.
Critical Chain Project Management (CCPM)
4
1 2
3 4
5
Critical Chain Project Management
Tradition Critical Path Planning
John
Each Task has BufferBad Multitasking
John
1 2
3
5
Feeding Buffer
4
Due
Date
Due
Date
Aggressive EstimationEliminate Multitasking
Project Buffer
Critical Chain Project Management (CCPM)
CCPM uses resource dependencies that may not be visible on project network workflow.
CCPM considers good enough solution is sufficient if it is delivered in the shortest time.
Monitoring & controlling the project buffer in place of earned value compared to critical path.
Critical chain project management involves estimating each task of workflow network aggressively eliminating the individual task buffers, aggregating a buffer for entire project at the end of critical path and managing this buffer to protect the project end date.
Theory of Constraints (TOC)
Identify
Exploit
SubordinateElevate
Repeat
Identify the system’s constraint
Decide how to exploit the constraint
Subordinate everything else to that decision
Elevate the constraint till it breaks
Repeat the process till system is optimized.
CCPM & TOC in waterfall
Monitoring & Control
Planning
Execution
Estimate each WBS task aggressively without any individual task buffer. Add an aggregated buffer at the end of critical path.
Avoid multitasking the critical path task resources. Encourage team to complete the assigned task ASAP.
Monitory buffer consumption as a function of project completion. Use TOC, feeding buffer, resource buffer to protect project due date.
CCPM & TOC in Agile
Release Planning
Sprint Planning
Sprint Retrospective
Requirements
Product Backlog Sprint Backlog
ProcessRecommendations
Working Software
Sprint Review
Daily Scrum
Sprint
Estimate aggressively in
release planning & sprint planning
Use TOC in resolving
impediments in iterations
Refine CCPM & TOC in sprint
retrospective
TOC & CCPM
Eliyahu M. Goldratt introduced Theory of constraints in 1984 in his book The Goal.
Eliyahu M. Goldratt introduced critical chain project management in 1997 in his book Critical Chain.
