People differ in the way they make decisions: some people prefer intuitive, some reflective decision making (Epstein et al., 1996). To assess these individual differences, a new measure was constructed assessing the individual preference for deliberation and the preference for intuition on two independent scales. Intuition is understood as a purely affective mode, not as a heuristic-affective mode as assumed by Epstein. Deliberation is understood as a reflective, cognition-based mode. Three studies totalling more than 2500 participants report the construction, the test of dimensionality and the validity of the scale. Preference for intuition correlates positively with fast decision making, extraversion and agreeableness. It is independent from the ability of logical thinking. Preference for deliberation correlates with conscientiousness, perfectionism, need for structure and is as well independent from logical thinking. As affect plays an increasingly important role in the decision literature, the new measure can be a useful device to research the role of affect in decision making.
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