Suggestions for improvements to the definitions of SPAR-H performance shaping factors, to the definitions of the levels, and suggestions for changes in the multipliers.

In this paper the definitions and the content of six of SPAR-H performance shaping factors are discussed. The six factors discussed are "Available time", "Stress/Stressors", "Experience/Training", "Procedures", "Fitness for Duty" and "Work Processes". The discussion is based on a literature study on performance shaping factors, on interviews with consultants that have done SPAR-H analysis in the petroleum industry and from reading Human Reliability Analysis reports where SPAR-H have been used. The conclusions in this paper are: 1) New description of SPAR-H PSFs should be developed where the descriptions of each PSF do not overlap so much. 2) The guidelines should also give more advice to help the analyst to select PSFs levels when multiple PSFs might have a positive or negative impact on error probabilities. 3) New multipliers should be developed from an expert judgment, which is based on a review of the existing literature on PSFs, and with knowledge of the work in control room today,