The current study investigated the Pritchard-Ashwood (P-A) Theory of Motivation (Pritchard & Ashwood, 2008) by examining a measure of P-A Theory labeled the Motivation Assessment System (MAS). P-A Theory combines prior motivation theories such as expectancy theory, goal setting theory, justice theory, and needs theory and consolidates them into one integrated theory of motivation. In essence, P-A theory posits that one’s motivation is determined by four perceptions, including the extent to which one believes: (a) his/her actions will lead to results, (b) his/her results will lead to positive evaluations, (c) his/her evaluations will lead to positive outcomes, and (d) his/her outcomes will satisfy his/her needs. The MAS is designed to capture P-A Theory by assessing these four perceptions, and this dissertation examined tenets of P-A Theory by investigating the measurement properties of the MAS via confirmatory factor analysis. Findings showed that the model set forth by P-A Theory had the best fit compared to the other competing models when analyzing MAS data, suggesting the MAS is an appropriate measure of P-A Theory. This research should help to bridge the gap between motivation theory and practice by providing initial evidence of support for a practical measure that captures the full spectrum of employee motivation as set forth in P-A Theory. Recommendations for future research using the MAS to study motivation are suggested.