Our research approach which is termed Cognitive Design Media (CDM) demonstrates how the cognitive phenomena of design can be supported in computerized environments. Our current work on the “sketch” project is introduced presented and illustrated. Sketching in design is considered to be one of the significant cognitive phenomena which supports exploration through re-representation in design. Until now, only the medium of hand drawing and sketching has been considered to support these processes. Rather than automating the traditional hand-made sketch, or interpreting sketches in a computer system, we are attempting to employ the computer to support one of the cognitive mechanism of re-representation which underlie the sketch activity.