Stevenson, Richard M. (1988, ASQC) Marcon Industries, Inc., Fort Worth, TX
System Safety analyses positively respond to the challenge of ensuring that quality is designed into hardware, software, and instructional material, right from the start. Poor quality design practices can be just as hazardous to the users of a product as poor quality assembly procedures or bad materials. System Safety is a discipline which attempts to identify all hazards and eliminate or control them during the design phase, rather than react to an accident. There are many techniques available to the system safety engineer - some more effective than others - some more time consuming and expensive to employ than others. This paper presents an evaluation of the more common techniques from a cost and benefit perspective, so that individuals can select the methodology in safety significant areas that will provide the highest quality that the application warrants.
The techniques which will be discussed are: (1) Failure More and Effects Analysis, (2) Criticality Analysis, (3) Preliminary Hazard Analysis, (4) Operating and Support Hazard Analysis, (5) Fault Hazard Analysis, (6) Event Tree Analysis, and (7) Fault Tree Analysis. These techniques can all be effective in the proper application. Some will yield more information than others, but sometimes the lack of design detail available does not warrant their use. This paper points out the strengths and weaknesses of each methodology, and discusses their most productive application.
Product safety,Liability prevention