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Purpose:This study aimed to estimate the impact of collective, or shared, leadership on key teacher variables and on student achievement. As well, it inquired about the relative contribution of different sources of such leadership and whether differences among patterns of collective leadership were related to differences in student achievement. Methods: Evidence included 2,570 teacher responses from 90 elementary and secondary schools in which four or more teachers completed usable surveys. Student achievement data in language and math averaged over 3 years were acquired through school Web sites. Data were analyzed using path-analytic techniques. Findings: Collective leadership explained a significant proportion of variation in student achievement across schools. Higher-achieving schools awarded leadership influence to all school members and other stakeholders to a greater degree than that of lower-achieving schools. These differences were most significant in relation to the leadership exercised by school teams, parents, and students. Principals were awarded the highest levels of influence in schools at all levels of achievement. Implications: Influence seems to be an infinite resource in schools. The more those in formal leadership roles give it away, the more they acquire.

Purpose -The goal of this study was to examine the relationship between four patterns of distributed leadership and a modified version of a variable Hoy et al. have labeled "teachers' academic optimism." The distributed leadership patterns reflect the extent to which the performance of leadership functions is consciously aligned across the sources of leadership, and the degree to which the approach is either planned or spontaneous. Design/methodology/approach -Data for the study were the responses of 1,640 elementary and secondary teachers in one Ontario school district to two forms of an online survey, xx items in form 1 and yy items in form 2. Two forms were used to reduce the response time required for completion and each form measured both overlapping and separate variables. Findings -The paper finds that high levels of academic optimism were positively and significantly associated with planned approaches to leadership distribution, and conversely, low levels of academic optimism were negatively and significantly associated with unplanned and unaligned approaches to leadership distribution. Originality/value -This study provides as-yet rare empirical evidence about the relationship between distributed leadership and other important school characteristics. It also adds support to arguments for the value of more coordinated forms of leadership distribution.