ICHE6(R3) – A document that describes the objective(s), design, methodology, statistical considerations and organisation of a trial. The protocol usually also gives the background and rationale for the trial, but these could be provided in other protocol referenced documents. Throughout the ICH GCP Guideline, the term protocol refers to protocol and protocol amendments.
MRCT – A complete description of the research plan and procedures. https://mrctcenter.org/glossaryterm/protocol/