This study focuses on the working contract between the on-site mentor and school-based counseling interns within the specific context of the on-site mentoring role, underlining the importance of the contract as a framework for empowering internship and mentoring. Guidelines concerning the main contents and processes needed for outlining an effective contract are presented. A study that examined expectations of mentors and interns regarding the components of the contract is presented with the aim of illustrating the creation of a data-driven basis for contracting. Four similar broad categories were located, although differences between mentors and interns in each category appeared. Implications of the working contract for the enhancement of the mentorship relationship and for the professional growth of mentors and interns are discussed. (Contains 1 table.)