(a) For purposes of this subpart, Administrator means the Administrator of the Environmental Protection Agency and any other officer or employee of the Environmental Protection Agency to whom authority has been delegated by the Administrator.

(b) Assent means a child's affirmative agreement to participate in research. Mere failure to object should not, absent affirmative agreement, be construed as assent.

(c) Permission means the agreement of parent(s) or guardian to the participation of their child or ward in research.

(d) Parent means a child's biological or adoptive parent.

(e) Guardian means an individual who is authorized under applicable State, Tribal, or local law to consent on behalf of a child to general medical care.

(f) Observational research means any research with human subjects that does not meet the definition of research involving intentional exposure of a human subject in § 26.202(a).