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Abstract This study tests the hypothesis that individual differences in trait maximization as well as in core personal values impact decision-making in dynamic and high-risk situations. 420 student-candidates at a Spanish police College (64.8 % male; 18 to 25 years) completed an online questionnaire that included maximization measures and core personal values. They then responded to three written vignettes that required dichotomous decisions (act vs. wait) under conditions of uncertainty. Multilevel modelling revealed that higher scores in maximization predicted a greater tendency to choose the action option later, but no differences were found in difficulty or perceived confidence. The tendency to wait was significantly higher among those who had wait-favouring core values; likewise, it was lower among those who had action-favouring core values. This study confirms the role of the trait maximization in the timeliness of decision-making, and illustrates the relationship between certain identified values, and decision making.