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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.
Download
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