34 CFR §300.115

1. (a)Each public agency must ensure that a continuum of alternative placements is available to meet the needs of children with disabilities for special education and related services.
2. (b)The continuum required in paragraph (a) of this section must—
   1. (1)Include the alternative placements listed in the definition of special education under § 300.39 (instruction in regular classes, special classes, special schools, home instruction, and instruction in hospitals and institutions); and
   2. (2)Make provision for supplementary services (such as resource room or itinerant instruction) to be provided in conjunction with regular class placement.