Examining the population level and individual level longitudinal stability of psychosocial measures in the US Army's Global Assessment Tool (GAT).

As a component of the US Army's Comprehensive Soldier and Family Fitness program (CSF2), the Global Assessment Tool (GAT) represents a multidimensional constellation of measures designed to assess characteristics related to resilience. Using a foundation of validated measures from prior research, the GAT has been the vehicle for self-assessment to provide Soldiers, their families, and Army Civilians snapshots of their psychosocial wellness. Despite the long history of the measurement instrument (first implemented in 2009) and widespread use (mandatory for all active-duty Soldiers annually), the longitudinal capabilities of the GAT has received little attention. Here, we examine the longitudinal stability of the GAT across an approximate five-year time frame and multiple statistical approaches that demonstrate measurement stability at both the aggregate population level (people on average) and the individual level. We find evidence that the majority of the measures within the GAT are relatively stable over time both at the population level and individual level. This evidence contributes to knowledge of how best to improve the GAT for future use with the pay-off for the Army being a self-assessment tool that is more effective and efficient.