Purpose – In Germany up until now, there has been very little research on staff development in schools. The purpose of this paper is to comprehensively assess school-based staff development and to describe the interplay between different instruments of staff development (e.g. classroom observations, development discussions) at the school level. Design/methodology/approach – Considering that different constellations of organizational management tools may be differentially effective in different contexts (see Mintzberg, 1983/1992), an approach that takes a combination of different staff development instruments into account was chosen. Data were gathered from principals of primary and secondary schools in two federal states of Germany. Using regression, cluster analysis, and analysis of variance, the authors examined different instruments and patterns of staff development used in everyday school practice and determined how these affected the professional development of teachers. Findings – Five staff develop...