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A principal investigator (PI) is the lead scientist or engineer for a particular well-defined science (or other research) project, such as a laboratory study or clinical trial. It is often used as a synonym for “head of the laboratory” or “research group leader”, not just for a particular study. In the context of USA federal funding from agencies such as the NIH or the NSF, the PI is the person who takes direct responsibility for completion of a funded project, directing the research and reporting directly to the funding agency. For small projects (which might involve 1-5 people) the PI is typically the person who conceived of the investigation, but for larger projects the PI may be selected by a team to obtain the best strategic advantage for the project. In the context of a clinical trial a PI may be an academic working with grants from NIH or other funding agencies, or may be effectively a contractor for a pharmaceutical company working on testing the safety and efficacy of new medicines. There were 20,458 PIs on NIH R01 grants in US biomedical research in 2000. In 2013, this number has grown to 21,511. At the same time the success rate for an applicant to receive an R01 grant has gone down from 32% in 2000 to 17% in 2013.

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