This manual is intended specifically for new teachers who will be working with reentry or "hard-to-serve" adults. Introductory materials include general information for high school teachers who will incorporate this new, diverse population into the secondary classroom, descriptions of who these new adult students will be, and a discussion of needed support services. An institutional needs assessment guide is provided to evaluate institutional readiness. Other sections focus on the following topics: differences between teen and adult students; considerations for effective teaching methods; perceptual learning styles; methods of presentation; cooperative learning; listening skills; good questioning; mathematics skills and the adult learner; the mathematics learning environment; teacher expectations and stereotypes; remediation; learning disabilities; encouragement of students with poor skills; effective praise; interpersonal dynamics in the classroom; and creation of a constructive environment. An exercise follows to guide the teacher from theory to practice. Also provided are stories of two reentry students who are having difficulties with their role as students, stories that encourage the teacher to consider the issues raised in the manual. Comments are offered for comparison with teachers' thoughts. Appendixes include the following lists: 10 general resources, 37 resources on adult learners, 8 resources on adult career counseling, and 4 organizational sources. (YLB)