1. Lean Principles and
Practices
Jelle

2. Origins
 The Toyota Production System
 Taiicho Ohno
 Jidoka
 Just-In-Time
 Shigeo Shingo
 Zero-Inspection
 Non-Stock Production
© E2 Partners

3. Deming cycle
Act Plan
Check Do
© E2 Partners

4. Some japanese
Muda
Mura
Muri
© E2 Partners

5. 7 Principles
The 7 base principles of lean software development

6. 7 Principles
 Eliminate waste
 Build Quality in
 Create Knowledge
 Defer Commitment
 Deliver fast
 Respect People
 Optimize the whole
© E2 Partners

7. Eliminate waste
 Identify
Value adding
Non-value adding
 Value stream mapping
© E2 Partners

8. Build Quality In
 Inspection
 Jidoka
 Encapsulation
© E2 Partners

9. Create Knowledge
 Enable Feedback Cycles
 Kaizen
 Retrospectives
© E2 Partners

10. Defer Commitment
 Set based development
 Real Options
 Architectural Decisions
© E2 Partners

11. Deliver fast
 Sears vs LL. Bean
 Incremental Delivery
 Repeatability
© E2 Partners

12. Respect People
Teamwork
Responsibility-Based
Planning
Control
Empower People
© E2 Partners

13. Optimize the whole
 Concept to Cash
 Value Stream
 Investigate Failure Demand
© E2 Partners

14. Waste
The 7 wastes in software development

15. Inventory
 Uncoded documentation
 Untested code
 Undeployed code
6000 70
5000
Release 60
4000 v1 50
40
3000
30
2000 20
1000 10
0
november december januari februari maart april 2011 mei 2011 juni 2011 juli 2011 augustus september oktober
2010 2010 2011 2011 2011 2011 2011 2011
2010 2011
Lines Added Lines Modified Lines Deleted Bug Count
© E2 Partners

16. Overproduction
7%
13%
45%
16%
19%
Always Often Sometimes Rarely Never
© E2 Partners

17. Extra processing
 Gold plating
 Not Invented Here Syndrome
 Frameworks
© E2 Partners

18. Transportation
 Handoffs of knowlegde
 Waterfall mindset
© E2 Partners

19. Motion
 Context switiching
100%
Productivity
80%
60%
40%
20%
0%
1 2 3 4 5
Number of “tasks"
Time spent on value adding tasks
© E2 Partners

20. Delays
 Lists
 Signoff gates
 Reviews
© E2 Partners

21. Defects
 Prevent rather than detect
 Failure demand
© E2 Partners

22. Mura
Stress on your system

23. Avoid stress
Think about this:
CPU at 100%
Highway at 100%
© E2 Partners

24. Pull based scheduling
 Reponsibility based
commitment
 Pull instead of push
© E2 Partners

25. Example
© E2 Partners

26. Muri
Identify and fix bottlenecks

27. Avoid bottlenecks
 Identify bottlenecks
 Reduce intake
 Fix bottleneck
 Increase intake
© E2 Partners

28. Visualize your flow
© E2 Partners

29. References
 http://jellebens.blogspot.com/
© E2 Partners