Dear Ahmeslabib,
Have you seen this report ?
It is called "Root Cause Analysis - Literature Review", by WS Atkins of the UK, for the UK HSE. It is report no. 325/2001, on the UK HSE website. Find their CCR page, it's
in the group of reports for 2001 - look for the number 325.
It reviews various methods and tools (some proprietary) for Root Cause Analysis. It also discusses the subject matter I general. I know it looks at TAPROOT, can't recall the other one though.
Cheers,
John.