Classroom management refers to all teachers’ actions aimed to create safe and stimulating learning environment. Many studies emphasize teacher's classroom management style as the most important factor related to students’ school achievement. Purpose of this work is to present the instrument designed for objective evaluation of teachers’ classroom management styles, according to Martin and Baldwin's (1993) understanding of the concept. The instrument distinguishes three styles: interventionist, non-interventionist and interactionist, and also covers three broad dimensions of classroom management - personality, teaching and discipline. Protocol presented in this paper, shows good reliability and could be recommended for research purposes.