EN
In 1997 Manfred Milinski published an influential paper entitled “How to avoid seven deadly sins in the study of behavior” in which he described in detail seven major errors relatively frequently committed during behavioral experiments and discussed their negative consequences. The list of mortal and venial sins in the analysis of behavior is, however, much longer and includes major and minor errors made at all successive steps of behavioral research: designing the experiment, selection and treatment of experimental animals, quantification of their behavior and statistical analysis of behavioral data. If unchecked, such errors may have extremely negative consequences and lead to incorrect conclusions. I will discuss a wide spectrum of examples of such errors taken from literature and from my own experience and discussions with other researchers.