The MyTeaching Partner-Secondary (MTP-S) coaching program for middle and high school teachers builds on research studies about effective coaching that have shown positive effects on teacher and student outcomes. For the past five years, Learning Forward has engaged in a project led by the American Institutes for Research (AIR) to better understand the MyTeachingPartner coaching model, especially its use in secondary schools (MTP-S). The project was funded by a 2017 grant from the U.S. Department of Education through its Education Innovation Research Program. Learning Forward's interest comes from its longstanding belief in the value of coaching as an integral part of a complete professional learning program because of coaches' ability to provide day-to-day support for learning. The MTP-S model aligns in many ways with the Standards for Professional Learning, which guide educators on acquiring new knowledge and applying new learning to improve practice and sustain improvements in student learning. This paper draws on interviews (both virtual and in person) with 20 teachers and 11 coaches in seven districts who experienced the model during the 2022--23 school year. This paper will describe the process of the MTP-S model, present the key findings, and close with considerations for a school or district preparing to embark on coaching. [This report was produced with Teachstone.]