Keeping Your PHP Lean

Keeping Your PHP Lean Chris Cornutt ccornutt@phpdeveloper.org ZendCon ’09 - Unconference Wednesday, October 21, 2009

What is Lean? The goal of lean thinking is to improve the development of applications by reducing waste both in the development process and in the processes surrounding it. This builds quality into the application and allows you to deliver a more complete, more robust end product. Wednesday, October 21, 2009

Being Lean • Customer value • Mapped value stream • Continuous ﬂow • Customer-focused pull • Strive for perfection Wednesday, October 21, 2009

History Lesson • based on Toyota Production System • “just in time” • Autonomation • DOTWIMP Wednesday, October 21, 2009

Types of Waste • Defects • Overproduction • Transportation • Waiting • Inventory • Motion • Processing • (Undervaluation) Wednesday, October 21, 2009

Lean Principles • Eliminate waste • Build quality in • Create knowledge • Defer commitment • Deliver fast • Respect people • Optimize the whole Wednesday, October 21, 2009

Agile vs Lean • Goals are different • Scope is different • Lean refines the process, not just the development • Play well together Wednesday, October 21, 2009

Lean thinks BIGGER and smaller... Agile Dev Customer Use Business Needs Wednesday, October 21, 2009

Lean Planning • Prioritize requirements • Consider code reuse • “Last responsible moment” • Streamline the ﬂow Wednesday, October 21, 2009

Practice Zero • Required for eﬀective development • Source control control • Scripted builds • Simpler testing, integration Wednesday, October 21, 2009

Importance of Testing • Good tests help with good code • Tests as documentation • Forces the developer to become a user • “Red, Green, Refactor” Wednesday, October 21, 2009

Less Code • Same amount of work • Just work smarter! • Fewer lines of code • Optimized, tested, eﬀective Wednesday, October 21, 2009

Lean Code • “Just in time” • Trim the fat • Implement best practices • Justify the future • Remember the 80/20 rule! Wednesday, October 21, 2009

Lean Terms Wednesday, October 21, 2009

Kaizen • Standardize • Calculate the performance diﬀerence • Implement it • Change standard to include new process • Lather, rinse, repeat Wednesday, October 21, 2009

Value Stream Map • Easily ﬁnd The Problems • Remove waste • Focuses on time, not cost • Assumes that the rest will follow Wednesday, October 21, 2009

VSM: Waterfall Wednesday, October 21, 2009

The Five Whys • Ask “why” • At least ﬁve times, more can be good too • Root cause discovery • Discovery along the way Wednesday, October 21, 2009

Kanban • Signal for replenishment • Similar to the Agile boards (post-its) • “Work unit” measurements • Limit each step’s units allowed • Make it visible! Wednesday, October 21, 2009

Kanban : Board Wednesday, October 21, 2009

Contact Chris Cornutt ccornutt@phpdeveloper.org @enygma @phpdeveloper http://joind.in/talk/view/973 Wednesday, October 21, 2009

Keeping Your PHP Lean

by Chris Cornutt on Oct 21, 2009

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Keeping Your PHP Lean — Presentation Transcript