Qualitative consequence analysis of failure can be estimated separately for each unit, system, equipment group or individual equipment item.

Qualitative consequence analysis relies on descriptive categories (e.g., High, Medium, Low) rather than precise numerical calculations. This method's foundation is the collective judgment of a multidisciplinary team of experts. These experts use their knowledge of the process, equipment, potential failure scenarios, and operational experience to assign a consequence category. While they consider data and process conditions, the final determination is based on their expert interpretation and consensus, which is the defining characteristic of a qualitative approach.

B. Using available data for direct calculation is characteristic of quantitative analysis, not qualitative.
C. Process and environmental conditions are factors considered by the experts, but expert knowledge is the basis for the estimation.
D. Qualitative analysis is not arbitrary; it is a structured process based on expert judgment and experience.

1. API Recommended Practice 580, Risk-Based Inspection, Third Edition, February 2016. Section 9.2, Qualitative Consequence Analysis: "In a qualitative approach, the team of experts uses their judgment and experience to assign a consequence category... The consequence is determined by a team of experts based on their knowledge of the equipment item, the process, and potential failure scenarios."