42 C.F.R. § 87.2
As used in this regulation:
Demonstration project grant means an award of funds to an eligible applicant to assist in meeting the cost of conducting a demonstration, either on a pilot or full-scale basis, of the technical or economic feasibility or application of a new or improved procedure, method, technique, or approach that will further the research purposes described in § 87.4 .
Principal investigator for a research project, or project director for a demonstration project, means a single individual who is responsible for the scientific and technical direction of the project.
Research project grant means an award of funds to an eligible applicant to assist in meeting the costs of conducting an identified research activity or program, study, or experiment that will further the research purposes described in § 87.4 .
Secretary means the Secretary of Health and Human Services and any other officer or employee of the Department of Health and Human Services to whom the authority involved has been delegated.
42 C.F.R. §87.2