34 C.F.R.  §300.532.  Evaluation procedures.

(b) A variety of assessment tools and strategies are used to gather relevant functional and developmental information about the child, including information provided by the parent, and information related to enabling the child to be involved in and progress in the general curriculum (or for a preschool child, to participate in appropriate activities), that may assist in determining--

(1) Whether the child is a child with a disability under Sec. 300.7; and
(2) The content of the child's IEP.