Co-teaching emerges in the 1960's during Progressive Education movement.
Legislation helped the advancement of co-teaching. Educators sought to modify instruction for a diverse student population.
Studies conducted show benefits of school based collaborative studies. This included improved academic and social skills of low-achieving students, improved attitudes and self-concepts reported by students with disabilities and more positive peer relationships.
No Child Left Behind
Like NCLB, these legal mandates focus their attention on students with increasingly diverse learning characteristics acheiving high academic performance in general education.