Clinical trial management: Roles of sponsors, CROs, and protocol risks

Clinical trial execution relies on the distinct roles of sponsors and contract research organizations (CROs). According to International Council for Harmonisation guidelines, a sponsor is the entity responsible for initiating, managing, and financing a trial. Sponsors, which include pharmaceutical companies and academic institutions, hold ultimate regulatory accountability and must oversee all contracted partners.

CROs are hired by sponsors to extend operational capacity and provide specialized expertise across the clinical development lifecycle, including site identification, monitoring, and data management.

Effective execution also depends on how personnel interpret trial protocols. Experts suggest that “fuzzy mental models”—where professionals rely on past experiences and assumptions rather than the specific requirements of a new study—can create hidden risks. To mitigate this, professionals recommend designing for how people actually learn, such as testing understanding under realistic conditions and surfacing critical requirements early to prevent assumptions from becoming mistakes.