In this clip you can meet the basics of how ArchiCAD tracks Revisions made to Layouts and how it displays relevant data on them. ArchiCAD has the ability to track revisions made to Layouts on a per Layout basis. Each Layout normally has one or more Drawings placed on them. If an Element or Change Marker linked to a Change appears in any Drawing placed on a given Layout then ArchiCAD considers that the given Layout has been revised. Each Layout is capable of displaying a Revision History, which lists in table form, all Revisions made to that Layout during the lifetime of the Project. One Revision of a Layout consists of one or more Changes affecting that Layout.