The document discusses teacher professional development for working with children with disabilities. It states that teacher training in child development is important, and teachers need to be part of an interdisciplinary team and implement plans set by other professionals. It also notes that teachers often feel unprepared for working with children with disabilities but supports are available. Additional ongoing training is needed as new children enroll. The document then discusses the applied developmental approach, focusing on viewing each child as an individual, understanding developmental principles, and using techniques like contingent stimulation, milieu teaching, and being responsive to teachable moments. Characteristics of effective teachers include enthusiasm, patience, consistency, and acting as a mediator between the child and environment.