2.1 Quality Assurance Definitions
adequate execution of all project tasks included in the study, and to ensure that all
modeling-based analysis is verifiable and defensible (Taylor, 1985).
The two major elements of quality assurance are quality control (QC) and quality
assessment (QA). Quality control refers to the procedures that ensure the quality of the
final product. These procedures include the use of appropriate methodology in
developing and applying computer simulation codes, adequate verification and validation
procedures, and proper usage of the selected methods and code. Quality assessment is
applied to monitor the quality control procedures and to evaluate the quality of the studies
(van der Heijde, 1987).