Minnesota Department of Education (MDE) collaborated with Wilder Research to conduct interviews with schools to understand how schools use their existing funding in order to sustain Multi-Tiered System of Supports (MTSS) implementation. The findings are presented in this report. Information on MDE's MTSS is included at the end of this report. MDE identified 21 schools to invite to participate in the voluntary interviews. These schools have been implementing MTSS for at least six years, participating in the annual Minnesota MTSS implementation surveys, and have made gains in one or more target academic areas of improvement (e.g., student reading proficiency, math proficiency, and graduation rate). They included small and large schools in the Twin Cities' metro area and greater Minnesota. Wilder Research sent an email invitation to the school principals. They could choose to have their MTSS team members in the interview. In addition, they were told that an MDE MTSS specialist would join the interview to hear firsthand from the school teams about their successes and challenges with funding their MTSS implementation, and supports they might need from MDE. Wilder completed interviews with 12 school teams in mid-March through early May 2021. Additionally, one school sent their responses via email. Findings from the interviews are presented by themes. Selected interviewees' comments are included in this report to illustrate the themes; they are slightly modified for clarity. Due to the small number of schools in the interviews, findings are not disaggregated by school characteristics. [For the summary report that presents the highlights "Funding Minnesota Multi-Tiered System of Supports: Key Findings and Recommendations," see ED616753.]