The Catalogue contains 358 entries which document all known architectural projects by Mackintosh from 1888 to 1920, and, as context, all projects by the practice of John Honeyman & Keppie (from 1901 Honeyman, Keppie & Mackintosh) during the Mackintosh years 1889 to 1913. Architecture has been broadly defined as involving structural work. Entries are also provided for monuments and exhibition displays; though arguably not architecture, these important outputs have not previously been systematically catalogued. The projects are classified according to four different categories of Mackintosh's authorship.
Projects by Mackintosh which are not recorded in the job books of the office and which have been judged as primarily interior decoration, for example the mural decorations at St Serf's, Dysart or Miss Cranston's Buchanan Street tea rooms, are not included. Information on such schemes, together with descriptions of the interior fitting-out of all of Mackintosh's buildings, is contained in Roger Billcliffe's comprehensive publication, Charles Rennie Mackintosh: The Complete Furniture, Furniture Drawings and Interior Designs (Cameron & Hollis, 4th edn 2009).