The methods and conventions of architectural history have undergone significant changes in the past few decades. But if the discipline is to continue to pursue ambitious questions, especially those about the societal roles of the built environment, further transformations will be necessary. By examining categories like agency, evidence, narrative, or appearance, the materials gathered under the DISCIPLINE umbrella interrogate the presumptions upon which value and meaning are assigned in and through the activities of architectural history. The ideas, arguments, and questions in the DISCIPLINE umbrella are focused upon aspects of the practice of architectural history in particular, and the modes and objects of architectural thinking more generally. The debate fostered by these materials is intended to be open-ended, to encourage a further expansion of the scope and the depth of disciplinary thinking.