Problems encountered in mainstreaming are described in this paper, with a focus on ways to avert them. Mainstreaming refers to the placement of selected special needs students in the regular classroom. Negative teacher attitudes toward mainstreaming present a major obstacle. Because teachers have a significant effect on program effectiveness, the administrator must take the responsibility to change teacher attitudes. Recommendations are made to provide teacher support services, balanced workloads, and staff development programs to increase understanding of special needs students. (Contains 12 references.) (LMI)