<p>The article is devoted to the experimental research of efficiency of solving psychodiagnostic tasks by the students-psychologists with different thinking styles. In the theoretical part a style of thinking as a determinant of successfulness is concerned. The hypothesis is the supposition that efficiency and ways of diagnostic tasks made by the students-psychologists are determined by a dominating thinking style. For the examination of the hypothesis the following methods were used: questionnaire “Styles of thinking” by Brams Harrison, the method of experiment (solution of 6 tasks from real consultative practice), content-analysis of protocols, correlation analysis by Ch. Spirman. The research has been done during some years with students...