EN
The article presents research on expectancy effect, described as effective attempt to predict the unspecific future. Studies on interpersonal expectancy effect, which have almost a hundred year’s tradition in social sciences, have been analyzed in detail. Due to the review/survey two important implications have been formulated: a methodological one (concerning the research course in social sciences) and a practical one (concerning the responsibility of those, whose expectations have, by definition, stronger prime mover in a given social interaction).