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The goals of human factors practitioners and industrial psychologists in situation awareness milieu are to assess individuals, teams, and organizations to measure current performance and predict future performance. The value in assessing situation awareness (SA) is that it impacts performance. Endsley (1995a) stated “SA provides the primary basis for subsequent decision making and performance in complex, dynamic systems.” The purpose of this paper is not to discuss or propose another means of describing or measuring SA but instead to propose the role of situation assessment (SAS) in identifying the nature of SA, product and/or process, regardless of the definition or explanation of SA. It appears the research efforts bypassed the fundamental building blocks and rationale for describing a concept and instead developed measuring instruments and explanations of a complex phenomenon. Simply stated, SA and SAS are related by SAS providing the mechanism-of-action for the measurement of SA.