This quantitative study was conducted to investigate possible relationships between psychological safety, collaborative capacity, and school climate in middle level schools in order to identify specific leadership behaviors to increase collective efficacy. School leaders' knowledge of the positive effect collective efficacy has on student learning is not enough (Donohoo & Katz, 2019; Parrett & Budge, 2020). Leaders must also be aware of functional behaviors to foster collective efficacy, thus increasing student learning (Donohoo & Katz, 2019). Based on the theoretical work of Bandura (2000, 2012), as well as DeWitt (2017), Garmston and Wellman (2013), Hattie (2017, 2019), and Rock (2013), the variables of psychological safety, collaborative capacity, and school climate were investigated. The sample for this study included certified faculty members in middle-level schools containing fifth through eighth grades. A survey was created by the researcher, and data were collected from the sample by "Qualtrics." Statistically significant relationships were found among all variables, with the exception of autonomy and both collaborative capacity and school climate, indicating specific leadership behaviors to foster collective efficacy among faculty members. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]