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This text presents a cognitive-psychology analysis of spontaneous, co-speechgestures in a face-to-face architectural design meeting (A1 in DTRS7). Thelong-term objective is to formulate specifications for remotecollaborative-design systems, especially for supporting the use of differentsemiotic modalities (multi-modal interaction). According to their function fordesign, interaction, and collaboration, we distinguish different gesturefamilies: representational (entity designating or specifying), organisational(management of discourse, interaction, or functional design actions),focalising, discourse and interaction modulating, and disambiguating gestures.Discussion and conclusion concern the following points. It is impossible toattribute fixed functions to particular gesture forms. "Designating" gesturesmay also have a design function. The gestures identified in A1 possess acertain generic character. The gestures identified are neither systematicallyirreplaceable, nor optional accessories to speech or drawing. We discuss thepossibilities for gesture in computer-supported collaborative software systems.The paper closes on our contribution to gesture studies and cognitive designresearch.

The Function of Gesture in an Architectural Design Meeting