The completion of a thesis is necessary in the training of future professionals in Psychology, it is an opportunity to practice values, skills and knowledge, although it also implies negative connotations in the students. For this reason, the present study aims to know the attitude of Mexican university students towards the completion of a thesis, as well as to determine the differences by sex and the relationship between the influencing factors in its preparation. A research with a non-experimental cross-sectional design, with exploratory, descriptive and correlational scopes was carried out, thus 598 students who are studying or have completed a degree in Psychology at the Benemérita Universidad Autónoma de Puebla (Mexico) participated. A questionnaire was applied consisting of an instrument that measures the perception variable of scientific research elaborated by Uribe, Márquez, A...