»Dimensions. Journal of Architectural Knowledge« is an academic journal in, on, and from the discipline of architecture, addressing the creation, constitution, and transmission of architectural knowledge. It explores methods genuine to the discipline and architectural modes of interdisciplinary methodological adaptions. Processes, procedures, and results of knowledge creation and practice are esteemed coequally, with particular attention to the architectural design and epistemologies of aesthetic practice and research. Issue 3, »Species of Theses an Other Pieces«, is concerned with the form of the doctoral thesis in practice-oriented research. In reference to George Perec's »Species of Spaces and Other Pieces«, this issue takes the love for playing with forms, genres, and arrangements as its program.