EN
The study focuses on the relationship between pro-social behaviour and the expectation of pro-social behaviour from the others. According to the social exchange theory and the norm of reciprocity, correlation can be expected. The sample consisted of 80 high school students. Pro-social behaviour and the expectation of pro-social behaviour were measured by means of an inventory. Pro-social behaviour was also measured by observation (respondents had three opportunities to behave pro-socially in standardized situations). The relationship between pro-social behaviour and its expectation was significantly manifested by the expectation of pro-social behaviour towards others in a real situation. People who behave more pro-socially expresses more clearly to other people that they should help others.