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We report an empirical study of people using mobile collaborative systems to support maintenance tasks on a bicycle. Results show that field workers make repairs more quickly and accurately when they have a remote expert helping them. Some pairs were connected by a shared video system, where the video camera focused on the active workspace and they communicated with full duplex audio. For other pairs, either the video was eliminated or the audio was reduced to half duplex (but not both). Pairs'doi:10.1145/240080.240190 dblp:conf/cscw/KrautMS96 fatcat:ywfao35hkfgnxfh47ybcyb475i