In the literature of recent years on the psychology of sports, there is a shortage of data on the psychological prerequisites for the effectiveness of sports teams. In Russian psychology, research in this area is constrained by the lack of diagnostic tools necessary for them. This article presents the results of adaptation and preliminary testing of the Collective Effectiveness Questionnaire for Sports – Collective Efficiency Questionnaire for Sports (hereinafter - CEQS). Preference was given to (CEQS) Short, Sullivan, Feltz (2005). The main difference between CEQS and other collective performance questionnaires is that CEQS is adapted to the functioning of team sports in general and, therefore, can be used in all sports. The appearance of any new well-tested diagnostic methodology for compliance with psychometric criteria will contribute not only to improving the effectiveness of psychological research, but also to obtaining more reliable data. Goal: Conducting the first stage of adaptation of the methodology of the «Collective Efficiency Questionnaire for Sports» («Collective Efficiency Questionnaire for Sports»). The abbreviated name of the CEQS methodology. Research methods. The first stage of adaptation of the methodology consisted in checking the reliability of its Russian version according to the criterion of internal consistency, which was carried out by determining the Kronbach coefficient, as well as determining the correlation coefficients between the values of the scores on the questionnaire items. related to a certain indicator with a total score for this indicator. The study involved 140 athletes-representatives of team sports of qualification from the 3rd junior category to the MSMC. The questionnaire was translated from English into Russian. CEQS consists of 20 points divided into 5 scales, athletes expressed their opinion using a 10-point Likert-type scale with scores from 1 to 10. The results of the study. The obtained values indicate the internal consistency of the Russian version of CEQS. The application of the methodology for assessing the collective effectiveness of various sports teams has shown that it allows us to assess the differences in the ratio of indicators of collective effectiveness in individual teams.