C4 (also written as C-4) is a method of problem solving similar to the PDCA cycle, but describes the Plan step more clearly.
It was developed by David Veech (with help from Mike Kirkby) to provide guidance to A3 templates and assist with developing people as problem solvers. It is used in conjunction with quality circles and improvement teams.
The 4 C’s stand for:
- Concern – Describe the current situation or problem that the team wants to resolve using data
- Cause – Identify all causes of the problem, using a fishbone diagram, and prioritize which ones to pursue
- Countermeasure – Identify a short-term action that may correct the root cause of the problem
- Confirm – Ensure that the countermeasure was successful, and implement any long-term countermeasures
The C4 card is used for small, daily improvements that are easier to solve, but still need a problem solving process to follow (see below)
The C4 worksheet is used for more challenging problems performed as a team, using the A3 one-page format structure.
- FOCUS-PDCA– creativesafetysupply.com
- Eight Steps To Practical Problem Solving– kaizen-news.com
- The Tools of Kaizen– blog.5stoday.com
- What is a Kaizen event?– lean-news.com
- PDCA: How Can this Tool Help You?– blog.creativesafetysupply.com
- 5 Kaizen Tools to Start Using– hiplogic.com
- The Concepts of Kaizen– creativesafetypublishing.com
- Applying Hoshin Kanri– 5snews.com