To explain human decision behaviour, a great number of theories had been formulated. A new model is the priority-heuristic (Brandstätter, Gigerenzer & Hertwig, 2006) This heuristic predicts both decisions and decision processes at solving simple monetary gamble problems. Pachur, Hertwig, Gigerenzer and Brandstätter (in press) afforded a current work to the discussions around the heuristic. They used two-outcome-problems to test its validity. Experiment 2 of their work should be replicated. Also analyses to especially created two- and three-outcome-problems were made. Questions around the claimed reading- and choice-phase were researched. The problems were presented to 40 participants, separated in two blocks of two- and three-outcome-problems. One half of the participants saw the problems in horizontal, one half in vertical display-order. Innovative in this context was the using of eye-tracking. Decisions, durations and the fixations-frequencies were recorded. The heuristic predicted decisions very well at both forms of problems, while duration-comparisons did not affirm the hypotheses. The analyses of the fixation-frequencies showed a higher impact of the maximum outcomes. But this was most likely the consequence of the in german language area used reading-direction. Eye-tracking presented surprising findings and is advisable for future research in decision behaviour.