Authorship
The categories broadly quantify the level of Mackintosh's involvement in a project, ranging from principal designer (Category 1) to no known input (Category 4). It is recognized that the process of developing a building is highly collaborative, ordinarily involving a range of skills, both creative and practical, and that more than one person within the practice would have been involved to varying degrees throughout the evolution and delivery of a project.
Category 1 and 2 projects include detailed comment and a range of illustrations. Category 3 and 4 projects are given more summary treatment, generally confined to Introduction, Drawings, Job Book and Bibliography; this reflects their status in relation to Mackintosh, not their individual importance.
Projects identified as designed by Mackintosh by reliable sources during his lifetime; or so distinctive in style that their authorship seems beyond doubt.
Browse projects (101)
Projects for which there is stylistic or documentary evidence that suggests Mackintosh designed a specific but relatively minor part.
Browse projects (25)
Projects for which there is evidence of Mackintosh's involvement but not in a design capacity e.g. the presence of annotations in his handwriting on drawings.
Browse projects (27)
Projects by the office dating from 1889-1913, for which there is no documentary or stylistic evidence of Mackintosh's involvement. Also projects which have been wrongly ascribed to Mackintosh in the past.
Browse projects (203)

Projects identified as designed by Mackintosh by reliable sources during his lifetime; or so distinctive in style that their authorship seems beyond doubt.
Projects for which there is stylistic or documentary evidence that suggests Mackintosh designed a specific but relatively minor part.
Projects for which there is evidence of Mackintosh's involvement but not in a design capacity e.g. the presence of annotations in his handwriting on drawings.
Projects by the office dating from 1889-1913, for which there is no documentary or stylistic evidence of Mackintosh's involvement. Also projects which have been wrongly ascribed to Mackintosh in the past.