ABSTRACT A critical requirement of the Individuals with Disabilities Education is that school personnel and parents collaborate in the development and implementation of students’ special education programs. Collaboration has been a crucial requirement of the IDEA since 1975. Collaboration is necessary in formulating student’s special education services and implementing programs that meet students’ needs. In this article, we examine the critical importance collaboration plays in special education law. To do so we examine (a) the history, evolution, and language of the IDEA; (b) rulings of the U.S. Supreme Court and other courts addressing issues in collaboration; and (c) regulations and policies from the U.S. Department of Education. To meet the mandates of the IDEA, school districts need to employ general education teachers, special education teachers, and building-level and district-level administrators with skills in collaborating to support the education of all students and to meet the requirements of the IDEA.