This document presents the most complete analysis of the use of the words control, oversight, etc. as used in NEA, IAEA and ICRP literature connected to radioactive waste disposal. It reveals the many different ways the same word, “control”, has been used in international guidance and ambiguities than can arise, especially so for the post-closure phase of the repository. The newly introduced ICRP terminology, namely the use of the words “oversight” and “built-in controls”, represents a step forward in terminology. Prepared for the RWMC Regulators' Forum meeting held on 24 - 25 March 2014.