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Collective teacher innovativeness has emerged as a recent topic of interest in both international policy documents and scholarly research. However, only a few studies have focused on the factors that enable collective teacher innovativeness, particularly in terms of revealing whether and to what extent school leadership might influence this construct. Existing literature suggests that distributed leadership can influence teachers' instructional practices, emotions, and daily activities, all of which could be important to teacher innovativeness. The present study, therefore, aimed to explore the effect of distributed leadership in fostering collective teacher innovativeness, as well as the mediating roles played by job satisfaction and professional collaboration, by using the Teaching and Learning International Survey 2018 dataset. The findings of the partial mediation structural equation model analysis revealed that distributed leadership has both direct and indirect effects on collective teacher innovativeness, as mediated by job satisfaction and professional collaboration. The results provide evidence of how principal leadership practices impact teachers' changes in behaviors through professional attitudes and practices.

This systematic review sought to expand our knowledge of the increasing research studies focusing on the empirical link between school leadership and student achievement. Using five different data sources (Scopus, WoS, ERIC, Google Scholar, and Retrospective Reference Harvesting Procedure), we created a data set of 144 journal articles. Descriptive analysis of bibliographic data and content analysis of full texts were employed in the review process. The results revealed instructional leadership as the most frequently used school leadership model in the relevant research. There has been a growing tendency to use the direct effect model with the increase in the studies from non-English speaking western societies. Indeed, the use of rational and organizational variables has dominated the mediating effect studies, while moderating effect studies as well as exploratory and explanatory type of studies have not received much attention. Based on these results, a framework representing the broader picture of the current research on the relationship between school leadership and student learning is provided. In addition, several recommendations were made, aiming to build the research capacity in furthering our understanding of how school leadership practices impact student learning and achievement.

Despite the growing scholarly interest in the effects of principal leadership on student achievement, empirical evidence concerning how principal qualifications might be related to student learning outcomes has been limited. This study investigates the relationship between different principal qualifications (prior experience in teaching, principalship and other school management roles, formal education, principal training, and professional development) and student achievement by analyzing cross-national teaching and learning international survey and program on international student assessment data from seven countries. The results showed that experience in principalship and other school management positions, principal training, and participation in networking activities and teaching/pedagogy-focused seminars had small but statistically significant associations with student achievement, though the results were not consistent across different subjects. Level of education and years of teaching experience did not, however, predict student achievement. Implications of the findings are offered for policy and further research.