Lean Software Development

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Lean Software Development

• Lean Industries Series

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Topics

• What is Lean?
• Root Causes of Software Failure
• Principles of Lean Software Development
• The Lean Imperative
• Implementing Lean Software Development
• Summary

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Root Causes of Software Failure

• Frequently and Rapidly Changing Customer
  Requirements
• They can not be fulfilled by a rigid design
• Centralized Decision Making
• increases the lead-time and makes the whole
  process rigid and slow

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Root Causes of Software Failure

• Rigid Project Scope Management
• Holding the project scope to exactly what was
  envisioned at the beginning of a project offers
  little value to the user whose world is changing
  and wastes time and space
• Traditional Software Practices (Linear
  Development
• Most quality issues are because of linearity in
  the development process that doesnt allow the
  iterations and quality checks to occur before the
  moving to next stage of development cycle

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Principles of Lean Software1. Eliminate Waste
The Seven Wastes of Manufacturing
Overproduction
Inventory
Extra Processing Steps
Motion
Defects
Waiting
Transportation
The Seven Wastes of Software Development
Extra Features
Requirements
Extra Steps
Finding Information
Bugs Not Caught by Tests
Waiting for Decisions
Handoffs
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Implementing Lean Software

• Change-Tolerant Software
• As products and features are added, complexity
  grows exponentially
• Complexity calcifies code, complex software
  becomes brittle and breaks easily
• The way to deal with complexity is to build
  change tolerance into the development process
  use a process that keeps code simple
• Simplify code as development proceeds
• All new code should be integrated into the code
  base daily or more often

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Summary

• Lean Software Development Principles Overview
• Eliminate waste
• Satisfy stake holders
• Empowerment
• Deploying comprehensive testing
• Deliver as fast as possible
• Refactoring
• Learn by experimentation
• Measure business impact
• Optimize across organization

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Summary

• Improve the System Brilliant products emerge
  from a unique combination of opportunity and
  technology.
• Focus on the Entire Value Stream from concept
  to cash. from customer request to deployed
  software.
• Deliver a Complete Product - Develop a complete
  product, not just software.  Complete products
  are built by complete teams.
• Measure UP - Measure process capability with
  cycle time. Measure team performance with
  delivered business value. Measure customer
  satisfaction with a net promoter score.

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Summary

• Lean thinking dictates that scope will take care
  of itself if the domain is well understood and
  there is a well-crafted, high-level agreement on
  the systems function in the domain
• Scope will take care of itself if the project is
  driven in time buckets that arent allowed to
  slip
• Scope will take care of itself if both parties
  focus on rapid development and problem solving,
  and adopt waste-free methods of achieving these
  goals
• The Lean Software Principles can make highest
  quality, lowest cost, shortest lead-time software
  development possible