Cyclic models

• Continuous improvement by cyclic iterations
• No problem is defined completely in the first try
• Therefore multiple cycles are necessary

• Deals how to tackle unknown problems

• Reference for cyclic models

• Toyota from 80s
• General Electric from 90s
• Apple from 2000s

Kaizen (Lean)

• Lean processes in Toyota

PDCA (Deming)

• Plan, Define, Check, Act
• Aka Deming circle/cycle/wheel
• It was defined by the Kaizen methodology

DMAIC (6 Sigma)

• Define, Measure, Analyze, Improve and Control (DMAIC)
• For 6 Sigma world
• Do not mistake on the same thing more than once!
• Control item

Sprint (Scrum)

• For software development!
• A little bit of chaos is added at each sprint
• Then it's organized during the sprint

MVP (Lean Startup)

• Minimal viable product
• And improve it with time
• A prototype!
• Define the time and the cost first!
• And then fit a product into this constraints

Try & Error

• Also a cyclic model!