This document discusses the definitions and foundations of ethics, guidelines, and regulations/laws as they relate to clinical research. It defines ethics as correct behavior dictated internally, guidelines as norms for behavior that are suggested but not enforced, and regulations/laws as behavior that is mandated or enforced by the state. It then discusses some of the key events that shaped modern ethical standards, including the unethical Nazi experiments, Nuremberg Code, Declaration of Helsinki, Thalidomide tragedy, and Tuskegee Syphilis study. The document concludes by outlining the three principles of the 1979 Belmont Report - respect for persons, beneficence, and justice.