This research studies the show actions to examine how participantsintegrate the three modalities of speech, camera control, and gestureduring TV conferencing. After introducing some concepts of individualshow action, the paper focuses attention on the cooperative show actionsof two person collaboration. Message exchange TV conferencing wassimulated to make observations on participants' free use of speech andcamera control modality to transmit certain objects to each other. Thecoordination and interaction of the two participants in modality choicewere compared when they exchange three types of object: formed text,mathematical expression and electronic circuit, with various sizes(complexity). Four models and nine types of the cooperative show actionswere defined by how participants expressed an object and what modalitythey chose for the expression. The results of experimentation confirmedthat participants' show actions varied, depending on the type and sizeof the objects
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