Lean [Software Development]

with Patrick Kua patrick.kua@thoughtworks.com

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Who am I?

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History

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Lean

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Lean manufacturing

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Lean manufacturing

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Lean manufacturing Lean product development

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Lean manufacturing Lean product development Lean software development

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Lean manufacturing Lean product development Lean software development

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Lean

Background to Lean manufacturing

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Time 1911 Principles of scientific management - Frederick Winslow Taylor

“Taylorism”!

1913

“In any colour, as long as it’s black”

12 hr -> 90 min Labour 85%

Meanwhile

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Meanwhile in Japan

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Time 1924 Toyoda produces looms

using US automation

1933

Business so good Toyoda start automobile arm

1937

“Toyota Motor Company” forms

1945

Deming arrives in Japan

1950

“Catch up with America”

1985

20 million exports

Toyota Production System Rolls out

1962

1 million exports

1969

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Taylorism!Economies of scale – one thing well!

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Lean!Complexity!

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Lean manufacturing

1984 1990

1991 2001 2006

Time

Lean product development

1988

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Agile Software Development Time

1990

2001

Lean manufacturing Lean product development Time

1984

1991 2006

1986

1997

1999

1999

2001

1988

Agile Software Development Time

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Lean manufacturing Lean product development

2001

Time

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Agile Software Development Time

Lean manufacturing Lean product development Time

2001

http://www.agilemanifesto.org

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Agile Software Development Time

Lean manufacturing Lean product development Time

2001

http://www.agilemanifesto.org “One of the early discussions was about a name. No one liked the term Lightweight. Several other options

were suggested, including Lean, and Adaptive. But the name Agile won the day.”

– ‘Uncle’ Bob Martin [1]

[1] (One of the Agile Manifesto authors) http://blog.objectmentor.com/articles/2007/07/10/the-founding-of-the-agile-alliance

Lean or agile

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and!

What is Lean?

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Product !

Development!

Problem Solving

People and Partners (Respect, challenge and grow them)

Process (Eliminating Waste)

Philosophy (Long term thinking)

Lean (Thinking)

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Problem Solving

People and Partners (Respect, challenge and grow them)

Process (Eliminating Waste)

Philosophy (Long term thinking)

Lean (Thinking)

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Problem Solving

People and Partners (Respect, challenge and grow them)

Process (Eliminating Waste)

Philosophy (Long term thinking)

Lean (Thinking)

5 Why’s

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Problem Statement

Why?

Why?

Why?

Why?

Why?

We fix this thing

Genchi Genbutsu

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“Go and see for yourself”!

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Oil

A distant place…

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Problem Solving

People and Partners (Respect, challenge and grow them)

Process (Eliminating Waste)

Philosophy (Long term thinking)

Lean (Thinking)

Value Stream Mapping

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Customer

Release Test Build Idea2on 

8 hours 20 hours 10 hours 1 hour

1 week 2 weeks 1 week 4 weeks

Value added time

Elapsed time 39 hours

320 hours = 12% efficiency

What is Lean Software Development?

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Principles of Lean Software Development

•  Eliminate Waste •  Create Knowledge •  Build Quality In •  Defer Commitment •  Deliver Fast •  Respect People •  Improve the System

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Agile Perception Filter

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Lean Perception Filter

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Lean & Agile Perception Filter

Eliminate Waste

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Card wall

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Analysis Development Testing Done

Agile Perception Filter

Card wall

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Analysis Development Testing Done

Agile Perception Filter Lean Perception Filter

Bottleneck!!!!!!

Create Knowledge

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Project start Project end

… 

OK 

Ta – Da! 

Grr… 

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… 

OK 

Project start Project end

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Not quite 

How’s this? 

… 

Project start Project end

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Ooo! 

And now? 

Project start Project end

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Ta – Da! 

Project start Project end

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Create Knowledge

Iteration Iteration Iteration

Agile uses iterations to learn

Defer Commitments

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Lean and Agile = Thinking with appropriate practices

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IT Business

Different practices for different problems

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Stories Stories

TDD

Refactoring

Continuous Integration

Iterations

Iterations

Co-location

Co-location

Showcases

Value stream mapping

Kaizen A3 Reports

Build quality in

Real Options Adaptive Planning

A final note…

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If you are doing the same thing you were doing last year, then you’re not

doing lean or agile!

Questions?

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