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3CA
MORT ECFA+ 3CA DORI Papers Archive

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Control Change Cause Analysis

Brief description   
3CA is a method of root cause analysis, designed to assist the manuainvestigation of accidents of any type. Investigators can use 3CA to help them identify significant  episodes within an accident and to structure inquiries into the reasons underlying them. 3CA is available in three forms: A, B and C.

Development
3CA has its origins in a co-operative project run by Humber Chemical Focus and the UK Health & Safety Executive (HSE) in 2000.  The 'A-form' of 3CA was produced in response to a need for a root cause tool that is quick to learn,  systematic, transparent and that produces results that are easy to communicate. During 2007-8, NRI worked with the UK Health and Safety Executive to revise the original 3CA materials; this work produced the B-form of 3CA. The two forms of 3CA are equivalent in terms of function, they are designed to perform the same analytical tasks. The differences between the two forms of 3CA are described in appendix 3 of the 3CA 'Form  B' manual.

In October 2009, the authors introduced a graphical approach to supporting the B-form of 3CA analysis. This began as a training prop and is proving effective in the field. A procedure for the graphical approach is given as an appendix to the 3CA (Form B) Manual and, from June 2010, as a dedicated manual. Analytical sheets are available for download by following the links given below.

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Last modified: Monday, 12 July 2010