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Seven Principles of Lean Software Development

January 20, 2009 by Przemysław Bielicki

Lean Software Development has its roots in Toyota Production System and it helps software organizations optimize their processes and production methods in order to deliver their products to the market much faster and with better quality. Lean movement can be considered as a new development method that tries to identify and eradicate all problems and "disabilities" of old methodologies like Waterfall. Lean puts main focus on people and communication - if people who produce the software are respected and they communicate efficiently, it is more likely that they will deliver good product and the final customer will be satisfied.

Lean Software Development subsequently gave birth to Agile Software Development methods and its main branches like Scrum or Crystal Clear. For many people who know the subject Agile is just another word for Lean or Lightweight.

In one of the most popular books on Lean subject, namely "Implementing Lean Software Development - from Concept to Cash", Mary and Tom Poppendieck explain how to implement Lean by following seven principles - principles that are some kind of Lean commandments:

  1. Eliminate Waste
    • Provide market and technical leadership - your company can be successful by producing innovative and technologically advanced products but you must understand what your customers value and you know what technology you're using can deliver
    • Create nothing but value - you have to be careful with all the processes you follow i.e. be sure that all of them are required and they are focused on creating value
    • Write less code - the more code you have the more tests you need thus it requires more work and if you're writing tests for features that are not needed you are simply wasting time
  2. Create Knowledge
    • Create design-build teams - leader of the development team has to listen to his/her members and ask smart questions encouraging them to look for the answers and to get back with encountered problems or invented solutions as soon as possible
    • Maintain a culture of constant improvement - create environment in which people will be constantly improving what they are working on - they should know that they are not and should not be perfect - they always have a field to improve and they should do it
    • Teach problem-solving methods - development team should behave like small research institute, they should establish hypotheses and conduct many rapid experiments in order to verify them
  3. Build Quality In
    • Synchronize - in order to achieve high quality in your software you should start worrying about it before you write single line of working code - don't wait with synchronization because it will hurt
    • Automate - automate testing, building, installations, anything that is routine, but do it smartly, do it in a way people can improve the process and change anything they want without worrying that after the change is done the software will stop working
    • Refactor - eliminate code duplication to ZERO - every time it shows up refactor the code, the tests, and the documentation to minimize the complexity
  4. Defer Commitment
    • Schedule Irreversible Decisions at the Last Responsible Moment - you should know where you want to go but you don't know the road very well, you will be discovering it day after day - the most important thing is to keep the right direction
    • Break Dependencies - components should be coupled as loosely as possible to enable implementation in any order
    • Maintain Options - develop multiple solutions for all critical decisions and see which one works best
  5. Optimize the Whole
    • Focus on the Entire Value Stream - focus on winning the whole race which is the software - don't optimize local inefficiencies, see the whole and optimize the whole organization
    • Deliver a Complete Product - teams need to have great leaders as well as great engineers, sales, marketing specialists, secretaries, etc. - they together can deliver great final products to their customers
  6. Deliver Fast
    • Work in small batches - reduce projects size, shorten release cycles, stabilize work environment (listen to what your velocity tells you), repeat what's good and eradicate practices that creates obstacles
    • Limit work to capacity - limit tasks queue to minimum (one or two iterations ahead is enough), don't be afraid of removing items from the queue - reject any work until you have an empty slot in your queue
    • Focus on cycle time, not utilization - put in your queue small tasks that cannot clog the process for a long time - reduce cycle time and have fewer things to process in your queue
  7. Respect People
    • Train team leaders/supervisors - give team leaders the training, the guidance and some free space to implement lean thinking in their environment
    • Move responsibility and decision making to the lowest possible level - let your people think and decide on their own - they know better how to implement difficult algorithms and apply state-of-the-art software frameworks
    • Foster pride in workmanship - encourage passionate involvement of your team members to what and how they do

If this brief introduction to Lean Software Development is still not enough for you I strongly recommend buying and reading Poppendiecks' book "Implementing Lean Software Development - from Concept to Cash".

About the Author: Przemysław graduated from Gdańsk University of Technology in 2004 having specialized in Distributed Information Systems. He worked in Lufthansa Systems, Intel Corporation in the past where he developed complex IT solutions in many Java-related technologies. In professional life he is a real Java expert holding couple of Sun Java certificates (Programmer, Developer, Web Developer) and Certified Scrum Master, of course.

Przemysław is a regular contributor to AgileSoftwareDevelopment.com and the author of "From Java to Java EE" blog. He now works as a Software Craftsman in an international company that is the leading Global Distribution System (GDS) and the biggest processor of travel bookings in the world. Contact Przemysław

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If Lean Software Development puts main focus on people and communication, why is it appears at the end of the list?

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September 21, 2013 by Nelson (not verified), 49 weeks 2 days ago
Comment id: 29381

How great post i just started my first year in informatics and this will help in the future thanks.

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September 22, 2013 by miguel (not verified), 49 weeks 1 day ago
Comment id: 29395

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September 23, 2013 by antonio (not verified), 49 weeks 1 hour ago
Comment id: 29436

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forgot to say thanks in

September 24, 2013 by antonio (not verified), 48 weeks 5 days ago
Comment id: 29457

forgot to say thanks in comment above lol

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