TY - JOUR AB - Purpose The purpose of this paper is to investigate how school principals’ leadership competence is enhanced by participation in municipal school district leader teams in the Norwegian context.Design/methodology/approach The study investigated a field sample of 854 school principals working in 252 municipal school leader teams. Hypotheses were developed and tested by using multiple regressions and structural equation modeling; whereas individual- and group-level effects were tested using a hierarchical linear modeling approach. Moderator analyses where undertaken.Findings The results indicate that a supportive group climate in school leader teams is the strongest predictor of the principals’ learning outcomes. Moreover, trust to the superintendent and having a competent municipal school owner apparatus also predicted this form of professional development. Moderator analysis provides supplementary insights by showing that the positive effect of a trusting relationship to superintendents is contingent of a competent school owner.Research limitations/implications The study reinforces the crucial importance of school superintendents creating a supportive and risk-free learning climate within their team of school leaders. The study underscores the importance of a competent school owner in Norwegian municipalities and the study places emphasis on a trusting relationship between school principals and their immediate superintendent.Practical implications The study highlights the importance that school district administrators develop municipal school leader teams toward effective learning system through internal competence development and a supportive group climate.Originality/value The study provides empirical evidence regarding the complex dynamics involved in the professional development of school principals in district leadership teams. VL - 33 IS - 5 SN - 0951-354X DO - 10.1108/IJEM-08-2017-0221 UR - https://doi.org/10.1108/IJEM-08-2017-0221 AU - Paulsen Jan Merok AU - Hjertø Kjell Brynjulf PY - 2019 Y1 - 2019/01/01 TI - Strengthening school principals’ professional development through effective school ownership in Norwegian municipalities T2 - International Journal of Educational Management PB - Emerald Publishing Limited SP - 939 EP - 953 Y2 - 2024/05/07 ER -