This study revisits the existing scholarly debate on the possible impact of the principal's leadership on student achievement. Both `direct effect' and `indirect effect' models are discussed. A quantitative meta-analysis examines to what extent principals directly affect student outcomes. The small positive effects found in this meta-analysis confirm earlier research findings on the limitations of the direct effects approach to linking leadership with student achievement. Finally, lines of future research inquiry are discussed.

This study aims to contribute to a better understanding of the antecedents and effects of educational leadership, and of the influence of the principal's leadership on intervening and outcome variables. A path analysis was conducted to test and validate a causal model. The results show no direct or indirect effects of educational leadership on student commitment; instead a reciprocal relationship was found between student commitment and strategic leadership. A range of antecedent variables appears to have more effects on the school culture than educational leadership has. Finally, the principal's vision has a substantial impact on his or her educational leadership behaviours. The findings suggest the importance of cognitive processes in order to understand the complex chain of variables through which principals have an impact on school effectiveness and school improvement. The results also underline the importance of conceptualizing leadership from a contingency approach.

School effectiveness research (SER) has flourished since the 1980s. In recent years, however, various authors have criticised several aspects of SER. A thorough review of recent criticism can serve as a good starting point for addressing the flaws of SER, where appropriate, thereby supporting its further development. This article begins by reviewing the criticism from different perspectives by discussing the political-ideological nature of SER, its theoretical limitations and the research methodology it applies. The review of each type of criticism is accompanied by a review of the recommendations that the critics propose for improving SER. We then proceed to present our views on each line of criticism and propose 5 avenues that we consider promising for the further development of SER.

A growing body of literature suggests that when schools become professional communities there are expected benefits in terms of teacher learning, school improvement and student achievement. In this article the concept of professional communities is examined for certain subject departments in Dutch secondary schools. The authors report on research into the extent to which mathematics departments operate as professional communities. At the same time, it was investigated whether the level at which departments operate as professional communities is related to student achievement. The results indicate that departments are cohesive bodies regulating teacher behaviour in several respects. However, as professional communities they do not focus on improving the quality of their teachers and instruction. Some characteristics of professional communities prove to be beneficial for student achievement, while others are not. The authors offer recommendations on how departments can develop into more professionally organised communities.

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