Critical Task Identification and Screening Analysis

This stage involves representing the structure of the tasks in which errors with severe consequences could occur, in a manner that allows the probabilities of these consequences to be generated. The usual forms of representation are event trees and fault trees. 

The purpose of the Critical Task Identification and Screening analysis is to reduce the amoimt of analysis required by focusing on tasks that have a significant error potential. The screening process essentially asks the following questions  

Is there a hazard present in the area of the plant (e.g., a reactor, or a complete process unit) being considered  

In this context the term hazard is taken to mean potential to cause harm, and would include any substance or plant item with characteristics such as toxicity, flammability, high voltage, mechanical energy, or asphyxiation potential. 

Given that there is a hazard present, are there any human interactions with the plant that could cause the harm potential to be released  

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