on Maintenance Reliability

When facilitating a Root Cause Analysis (RCA), the proper questioning process will make or break the effectiveness of the entire analysis. When we hear of the 5-Why’s as a valid RCA approach, is simply asking ‘Why?’ 5x good enough….or IS IT JUST OK?

Think about it this way, if I asked you ‘How Could’ the crime have occurred versus ‘Why’ the crime occurred, would your answers be different?

I am going to take a very basic (101) case study and format it using a logic tree (graphical expression of cause-and-effect logic). As we are guided through this mental process we will discuss the differences between asking ‘How Can?’ and ‘Why?’.

There is great variation when it comes to a common understanding of the term ‘Root Cause Analysis’ or RCA. 

In a previous, lengthy paper, I wrote an article entitled “The Stigma of RCA: What’s In a Name?“. It focused on common understandings (or misunderstandings) of what RCA means and then described the basic steps of any investigative occupation. I just left it up to the reader to determine if their ‘RCA’ approach had room for improvement. 

“Preventing process accidents requires vigilance. The passing of time without a process accident is not necessarily an indication that all is well and may contribute to a dangerous and growing sense of complacency. When people lose an appreciation of how their safety systems were intended to work, safety systems and controls can deteriorate, lessons can be forgotten, and hazards and deviations from safe operating procedures can be accepted.