responsible party role principal investigator role principal investigator role CDISC definition: A person responsible for the conduct of the clinical trial at a trial site. If a trial is conducted by a team of individuals at a trial site, the investigator is the responsible leader of the team and may be called the principal investigator. 2. The individual principal investigator. 2. The individual under whose immediate direction the test article is administered or dispensed to, or used involving, a subject, or, in the event of an investigation conducted by a team of individuals, is See also sponsor-investigator.; Leiter der klinischen Prufung.Under the German Drug Law, the physician who is head of the clinical investigation (CDISC): coordinating investigator (CDISC) (also study coordinator, MUSC); sponsor-investigator. An individual who both initiates and conducts, alone or with others, a clinical trial, and under whose immediate direction the investigational product is administered to, dispensed to, or used by a subject.NOTE: The term does not include any person other than an individual, hence not a corporation, agency (CDISC) a responsible party role played by a person responsible for the overall conduct of a study principal investigator Person: Jennifer Fostel metadata incomplete