The Departmental Action Leadership Institute (DALI), a component of the Effective Practices for Physics Programs (EP3) Initiative, works with physics departments to help them implement improvements to their undergraduate programs. Each participating department designates two faculty members as change leaders. These change leaders participate in DALI activities for one year, through which they learn about, reflect on, and implement effective change practices. During DALI, the change leaders facilitate local teams based on the Department Action Team (DAT) model. We introduce the DALI model, including some of the principles that went into its design. We then present some of the results from a summative assessment of the first DALI cohort. We focus on the growth of change agents' feeling of preparedness to enact components of effective departmental change and on their increased feelings of motivation and ability to create change.