what is the difference between root analysis and common analysis?
I am a Chinses translator and when i met these two terms together in a doc, i did not have any concept about them. Many thanks if any of you could give me some information or examples about it. And my E-mail address is xiaoxuan325@163.com

China Girl,

I believe these two terms should be addressed to a computer programmer or someone with programming knowledge. Both root and common analysis are used in program development and its sub-routines.
However, if you are referring to root cause analysis (RCA) and common analysis. The difference is, RCA is a problem solving process that engages various tools to identify and resolve the origin of a problem; while common analysis is used to identify failure rates and mechanism in software program.....I think??
My 2 bits worth!

Regards...Rajan Muthukrishnan

I think the term you're addressing is: Root Cause Analysis which is the problem's source.

Common analysis may take on a variety of subjects but in the vibration world it may be: PdM route analyses which may entail exception reports and/or basic approches to spotting trouble - or vibration trouble-shooting which should take on a set pattern of data collection and information gathering utilizing more advanced techniques or more complex methods that also incorporate RCA (root cause analysis) into the process.

I haven't heard of "root analysis" or "common analysis".

I would guess that maybe the two terms you wanted to address were
"root cause analysis"
and
"common cause analysis"

Root cause analysis was discussed above. It attempts to establish the fundamental cause of a single event.

Common cause analysis examines many events at a given facility or company and attempts to identify whether there is a small group of factors that contributed to most of the events ((common causes). Factors which contribute to multiple undesirable events within an organization may deserve more attention than factors that contribute to only a single event.