Purpose of FMEA is to analyse the design 
characteristics relative to the planned manufacturing 
process as to ensure the resultant product meets the 
customer needs and expectations. When potential failure 
modes are identified, corrective action can be taken to 
eliminate or continually reduce the potential for 
occurrence. The FMEA approach also documents the 
rationale for a particular manufacturing process. FMEA 
provides an organized, critical analysis of potential failure 
modes of the system being defined and identifies 
associated causes. It uses occurrence and detection 
probabilities in conjunction with a severity criterion to 
develop a risk priority number (RPN) for ranking 
corrective action considerations. When potential failure 
modes are identified, corrective action can be taken to 
eliminate them or to continually reduce a potential 
occurrence. (Mario Villacourt, 1992).