Educational diagnosticians assess the educational, learning styles, and program needs of students referred to special education for evaluation services and conduct re-evaluations of students currently receiving special education services.  Educational diagnosticians provide diagnostic information and work cooperatively with instructional personnel to provide an appropriate educational program for students with disabilities.

Categories of special education as defined by IDEA and addressed in the school setting are Autism, Deaf-Blindness, Deaf or Hard of Hearing, Emotional Disturbance, Intellectual Disability, Multiple Disabilities, Non-Categorical Early Childhood, Orthopedic Impairment, Other Health Impairment, Specific Learning Disability, Speech or Language Impairment, Traumatic Brain Injury, Visual Impairment. More information about these categories can be found in Legal Framework.