This document summarizes the key guidelines of ICH GCP (E6), which provides a unified quality standard for clinical trials involving human subjects. It outlines standards for clinical trial design, conduct, oversight and reporting. The objectives are to protect subject rights and safety, and ensure credibility of trial data. Key sections describe principles of GCP, responsibilities of investigators, sponsors and oversight bodies like IRBs/IECs, requirements for protocols, informed consent, safety reporting and essential trial documents. Compliance with GCP provides public assurance that trial data can be relied upon to support regulatory approval.