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As team members temporarily assume the role of leader, a system of shared leadership emerges. This study had three purposes: (a) to test the underlying three dimensions of shared leadership behaviors, (b) to examine the relationship between shared leadership behaviors and team performance, and (c) to examine the mediating effect of trust between team members’ perceptions of shared leadership and performance.

We used the sub-dimensions of shared leadership: relation-oriented shared leadership (ROSL), task-oriented shared leadership (TOSL), and creativity-oriented shared leadership (COSL). We collected survey data from college student teams at two different time points.

This study’s factor analysis results supported a second-order factor model that explains shared leadership with TOSL, ROSL, and a new COSL construct. Additionally, we discovered that shared leadership behaviors predicted team performance both directly and indirectly through team trust.

This study confirms the role of the new sub-dimension of COSL originally discovered by video analysis of project teams (Leight et al., 2018), thereby adding value to shared leadership research. This quantitative study supports the COSL with TOSL and ROSL in a second-order model where each component contributes unique input into the team dynamics. Our findings underscore the significance of shared leadership in elevating team trust, ultimately resulting in improved team performance. This insight holds particular relevance for educational management and leadership, offering a framework for understanding how shared leadership practices can positively influence team dynamics within academic contexts.

This chapter examines how groups' tactical selection shapes social movement mobilization and survival. I focus on 35 Indivisible groups founded in 10 American cities immediately after the 2017 Women's March. I analyze the descriptions of over 8,000 events on group Facebook pages from 2017–2019 and conduct 25 interviews with group members. These data allow me to assess how the type, diversity, and flexibility of tactics shape group mobilization and survival. I find that groups that use more protest and electoral tactics and those that use a diversity of tactics host more events and are more likely to survive over time. Being consistent in tactics was successful when groups used political tactics, particularly protest and electoral activities. Groups that engaged in a variety of tactics could also be successful, particularly in smaller and more conservative settings. This research illuminates the complex and situational ways that tactical choices matter for social movement longevity.

Infrastructure projects are pivotal for regional economic development, but also face low project effectiveness. Leadership is always regarded as a key enabler for project team effectiveness, including vertical leadership and team-level leadership. The purpose of this paper is to examine how vertical leadership facilitates shared leadership in infrastructure project teams.

This paper develops the conceptual model based on the literature review. Then the questionnaire survey was conducted. The empirical data obtained from 117 infrastructure project teams in China were analyzed by partial least squares structural equation modeling (PLS-SEM) for validating the proposed model. Finally, the results were comparatively discussed to explain the dual-pathway between vertical leadership and shared leadership. And the practical implications were presented for the project managers in infrastructure project teams.

Drawing on social learning theory and social cognitive theory, the results show that both participative leadership and task-oriented leadership can facilitate shared leadership. Further, team atmosphere fully mediates the link between participative leadership and shared leadership. Team efficacy fully mediates the relation between task-oriented leadership and shared leadership. Also, role clarity has a negative moderating effect on the former path.

The study extends the knowledge of leadership theory in the construction field. Based on the proposed conceptual model and PLS-SEM results, this study unveils the black box between vertical leadership and shared leadership and contributes to the theory of leadership on how the impact of different vertical leadership on team process promotes shared leadership.