Educators generally say that some students with special needs are not good candidates for inclusion. Many schools expect a fully included student to be working at or near grade level, but more fundamental requirements exist: First, being included requires that the student is able to attend school. Students that are entirely excluded from school (for example, due to long-term hospitalization), or who are educated outside of schools (for example, due to enrollment in a distance education program) cannot attempt inclusion.
Additionally, some students with special needs are poor candidates for inclusion because of their effect on other students. For example, students with severe behavioral problems, such that they represent a serious physical danger to others, are poor candidates for inclusion, because the school has a duty to provide a safe environment to all students and staff.
Finally, some students are not good candidates for inclusion because the normal activities in a general education classroom will prevent them from learning. For example, a student with severe attention difficulties or extreme sensory processing disorders might be highly distracted or distressed by the presence of other students working at their desks. Inclusion needs to be appropriate to the child's unique needs.
Most students with special needs do not fall into these extreme categories, as most students do attend school, are not violent, do not have severe sensory processing disorders, etc.
The students that are most commonly included are those with physical disabilities that have no or little effect on their academic work (diabetes mellitus, epilepsy, food allergies, paralysis), students with all types of mild disabilities, and students whose disabilities require relatively few specialized services.
Bowe says that regular inclusion, but not full inclusion, is a reasonable approach for a significant majority of students with special needs. He also says that for some students, notably those with severe autism spectrum disorders or mental retardation, as well as many who are deaf or have multiple disabilities, even regular inclusion may not offer an appropriate education. Teachers of students with autism spectrum disorders sometimes use antecedent procedures, delayed contingencies, self-management strategies, peer-mediated interventions, pivotal response training and naturalistic teaching strategies.