An important phenomenon in the study of behavioral decision-making is the surprising finding that people who are given choices framed in positive vs. negative terms exhibit different preferences. This study focused on a newer question: what factors influence the selection of frames by decision-makers? The development of a decision frame that has positive or negative overall value is a process that can be influenced by a number of factors. Several theoretical approaches to decision-making were examined with respect to making predictions regarding factors that would influence frame selection: mental accounting, task complexity, mental workload, expertise, regulatory focus, and message formulation goals. Predictions were extrapolated from each of these approaches and tested with data from a real-world decision-making situation - planning conversations from a set of NASA mission control meetings. The planning statements were transcribed and coded for frame selection and other behavioral/situational elements that were predicted to be related to frame selection. Mental accounting was not found to be related to frame selection. A predominance of positive framing, along with minimal use of negations, provided some support for the influence of positive expression bias. There was also evidence for aspiration mode impacting the selection of frame. The strongest predictor of frame selection, however, was an increase in expertise that occurred over the course of the mission. Between early and late mission phases, there was a significant decrease in positive framing, and this decrease interacted with task complexity. Based on these results, the hypothesis was proposed that decision-makers use opportunities for action as a means to frame decisions
