Part 0 Guidance. Part 0 is the first part of the suite of standards under the ISO 19650 heading. This document is a national level publication which is designed to explain to the industry the changes required to deliver BIM in line with ISO 19650 and in a localized context. The Part 0 document bridges the gap between the current state before the implementation of ISO 19650 and the future state with it. Part 0 outlines how and existing national standards will be maintained or superseeded from the introduction of ISO 19650. The Part 0 Guidance document walks through the process of identifying what currently exists and what needs to be changed as part of the move to adopting ISO 19650 in your country.