This paper presents a set of typical fallacies that accompany us in everyday decision-making. One of them is the pre-decisional distortion of information which consists in a tendency to increase the difference between attractiveness of the chosen and rejected alternatives. Another well-known bias is the influence of judgments made in one attribute on judgments in other attributes. This phenomenon is known as the halo effect. An equally common cognitive biasis the primacy effect which refers to overestimating information that appears first and underestimating data presented later in the serial position. The evaluation of choice alternatives is also influenced by other, less known phenomena: the context effect and the framing effect. The former is esponsible in particular for to tendencies: (2) avoiding extreme choice options and (2) the effect of asymmetric dominance. The latter describes a situation where the evaluation and choice may depend on whether the same result is presented in one or another way. Overcoming cognitive biases of judgment is not easy. The best way seems to be to arrange evaluation conditions in such a way that will prevent fallacies from occurring.