How changes to a drawing are recorded: revision codes, revision tables, clouds and triangles, and the transmittals that prove who received which revision.
Drawing revisions are the record of how a sheet changes over its life. Each revision gets a code, a date, a description and the initials of who made and checked it; clouds and revision triangles mark where on the sheet it changed; and transmittals record which revision was sent to whom and when.
Under ISO 19650 practice, shared work carries preliminary revisions (P01, P02, with point versions such as P01.1 in work in progress), and published contractual information carries C revisions. The status and revision are metadata in the CDE and should be read onto the sheet from there. Every issue goes out with a transmittal, so the project can prove who had which revision on which date.
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