We investigated the role of HUDs in CAI. HUDs have been used in varioussituations in daily lives by recent downsizing and cost down of the displaydevices. CAI is one of the promising applications for HUDs. We have developedan HUD-based CAI system for effectively presenting instructions of theequipment in the transportable earth station. This chapter described HUDs inCAI from a viewpoint of human-computer interaction based on the developmentexperience.
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