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Numerous studies have been conducted in the technology adoption domain. However, this is merely an initial step toward eventual success of an information technology (IT) system. Recent endeavour has increasingly shifted to continued IT use, or continuance, which is deemed essential to the survival of an IT system. In this article, a comprehensive review of studies on IT continuance has been conducted. Four major models have been identified: continuance as an extension of adoption, expectancy-disconfirmation theory, temporal updating mechanisms, and habit. It is now generally agreed that the first model is not readily applicable to IT continuance because most determinants of IT adoption are not robust predictors of continued use except for perceived usefulness. Other models present much higher explanatory power. Nonetheless, they have not tapped the emotional aspect over the course of IT use. Further investigation in this area is needed. [ABSTRACT FROM PUBLISHER]

The objectives of this study are to apply unexpectedness to the behavioral design of an entertainment robot and to evaluate the impression and satisfaction provided by the robot. Participants(N=44) observed four robot behaviors, which are distinguished by type of expectancy disconfirmation (positive disconfirmation, negative disconfirmation, simply confirmation, unexpected disconfirmation), and evaluated each behavior in terms of novelty, enjoyment, satisfaction, performance, and reliability. Participants perceived the unexpected disconfirmation behavior to be more novel and enjoyable such that they preferred this type over the other types. On the other hand, they evaluated the positive disconfirmation behavior as more intelligent and reliable than the other types. These findings will provide an essential basis for designing the behavior of an entertainment robot with the use of unexpectedness. [ABSTRACT FROM AUTHOR]