The traditional sketch using pencil and paper is an indispensable medium for architects. Digital technology both imitates and extends the possibilities of the sketch into a new form, the Architectural Digital Sketch. In this paper, we present a descriptive framework from the theoretical perspective of technology parameters. This framework covers traditional and digital sketch. We investigated several representative tools for sketching employing the framework, such as traditional sketch, Wacom SmartPen, iPad Pro, Foldable Notebook Lenovo ThinkPad X1 and Hyve3D. We demonstrate how the framework gives a unified approach to such widely varied tools.