 HAZOP-type studies may also be carried out by considering applicable guide words and identifying elements to which they are applicable or by considering the parameters associated with plant elements and systematically applying guide words to them; although this last approach is not mentioned in the relevant standard, its examples of output include a study (B3) recorded in this way.The following table gives an overview of commonly used guide word - parameter pairs and common interpretations of them.Once the causes and effects of any potential hazards have been established, the system being studied can then be modified to improve its safety.