The instructional concept guide is part of a system developed for tutor training and support. It is primarily designed for volunteers, but it can also be adapted to the training of paraprofessional tutors for any type of adult literacy program. A key component in the system is the Tutor Support Library, consisting of Instructional Concept Guides (training and reference aids for tutors) and Functional Content Units (models for the practical application of tutoring skills). Guide Twelve offers suggestions to help the tutor (1) recognize when the tutoring relationship should be ended and (2) end the relationship in a way that benefits the student and the tutor. The following topics are discussed: considering the next step for the student, changing tutors, evaluating student progress (including student self-evaluation), impasse (traumatic or otherwise), and evaluating tutor skill growth. (Author/MS)