The correct phrase is "Principal Investigator."
Principal Investigator. … The principal investigator prepares and carries out the clinical trial protocol (plan for the study) or research paid for by the grant. The Principal Investigator provides guidance and mentorship on responsible clinical trial conduct to other researchers or research trainees under their supervision, promotes education and training in responsible clinical trial conduct and complies with the relevant laws, regulations, disciplinary standards, ethics guidelines and institutional policies related to responsible clinical trial conduct. and Ph.D. in Economics from New York University (US). A principle is a rule, a law, a guideline, or a fact. A Principal Investigator or PI is the individual responsible for the preparation, conduct, and administration of a research grant, cooperative agreement, training or public service project, contract, or other sponsored project. Nicholas Vonortas Professor at George Washington University (United States), holder of the SPEC Professor Vonortas received his BA in economics from Athens University (Greece), his MA in Economic Development from Leicester University (UK), and his M.Phil. principal investigator listen (PRIN-sih-pul in-VES-tih-GAY-ter) The person(s) in charge of a clinical trial or a scientific research grant. The principal investigator is responsible for knowing the research regulations that apply to their study, additional requirements imposed by the funding agency, study sponsor and relevant regulatory authority (e.g. He joined the Elliott School in 1990. The phrase is also often used as a synonym for "head of the laboratory" or "research group leader." A principal is a chief or head. Who is eligible to be a Principal Investigator? Overview of Principal Investigator Responsibilities. In Canada and the United States, the term principal investigator (PI) refers to the holder of an independent grant and the lead researcher for the grant project, usually in the sciences, such as a laboratory study or a clinical trial. The two words are not interchangeable.