Organizations and people is one of the four dimensions of service management that influence the effectiveness and efficiency of service delivery1. This dimension focuses on the roles, responsibilities, and systems of authority that are needed to deliver and support services2. This dimension also covers the culture, skills, competencies, and collaboration of the people involved in service management3. References: ITIL Foundation - ITIL 4 Edition, page 8; ITIL4 - A Pocket Guide, page 19; ITIL4 Practice Guide:
Organizational Change Management, page 7.

Nonrepudiation provides an assurance that the sender of data is provided with proof of delivery and the recipient is provided with proof of the sender's identity, so neither can later deny having processed the data.
Further, this concept can apply to any activity, not just the sending and receiving of data; in a more general sense, it is a mechanism to prove that an activity was performed and by whom. Nonrepudiation is typically comprised of authentication, auditing/logging, and cryptography services.
https://www.sciencedirect.com/topics/computer-science/nonrepudiation