34 C.F.R.  §300.535.  Procedures for determining eligibility and placement.

(a) In interpreting evaluation data for the purpose of determining if a child is a child with a disability under Sec. 300.7, and the educational needs of the child, each public agency shall--

(1) Draw upon information from a variety of sources, including aptitude and achievement tests, parent input, teacher recommendations, physical condition, social or cultural background, and adaptive behavior; and
(2) Ensure that information obtained from all of these sources is documented and carefully considered.

(b) If a determination is made that a child has a disability and
needs special education and related services, an IEP must be developed
for the child in accordance with Secs. 300.340-300.350.