The safety community, bolstered by the PSM regulations, has emphasized the importance of proper Management of Change (MOC) to ensure safe, reliable and economic operation of chemical plants and refineries. Yet, at many sites, the MOC process is often harshly criticized as being
too burdensome.
In order to assess the validity of these criticisms, it is necessary to quantify and measure characteristics of the MOC business process.
This paper describes conceptual and computational models of the MOC business process, which provide a platform for quantitative assessments of various parameters such as effort, duration, cost, and so on.
An MOC Standard Model is developed and validated. This provides a benchmark against which MOC alternatives can be measured. The characteristics of the MOC Standard Model provide guidance for policy decisions that are immediately applicable by practitioners wishing to create or improve their MOC processes.
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