Tacit knowledge sharing discussed in this study is important in the area of business ethics, because an unwillingness to share knowledge that may hurt an organization’s survival is seen as being seriously unethical. In the proposed model of this study, distributive justice, procedural justice, and cooperativeness influence tacit knowledge sharing indirectly via two mediators: organizational commitment and trust in co-workers. Accordingly, instrumental ties and expressive ties influence tacit knowledge sharing indirectly only via the mediation of trust in co-workers. The model is assessed by using data from different companies’ employees, who attend an evening college in Taiwan for advance study. The test results of this study indicate that tacit knowledge sharing is affected by distributive justice, procedural justice, and cooperativeness indirectly via organizational commitment. Additionally, tacit knowledge sharing is also affected by distributive justice, instrumental ties, and expressive ties via trust in co-workers. The paths from procedural justice and cooperativeness to trust in co-workers are shown to be insignificant. Managerial implications of the empirical findings are also provided. Copyright Springer Science+Business Media, Inc. 2007Knowledge management, organizational commitment, trust in co-workers, justice, cooperativeness,

Purpose -This study proposes a model of online purchase intentions. Four exogenous constructsnamely, personal awareness of security, personal innovativeness, perceived ease of purchasing, and perceived usefulness -have not only direct influences on attitudes and online purchase intentions, but also have indirect influences on online purchase intentions through the mediation of attitudes. Design/methodology/approach -Data were collected via questionnaires from customers of the leading internet service provider (ISP) in Taiwan. Structural equation modeling (SEM) was used to examine the model. Findings -The influences of personal innovativeness and perceived usefulness on attitudes and online purchase intentions are similar for males and females. The influences of personal awareness of security on both attitudes and online purchase intentions are strong for males, while no such effects exist for females. The influences of perceived ease of purchasing on both attitudes and online purchase intentions are stronger for females than for males. Research limitations/implications -There are several limitations. For example, there may exist common method variance, and the generalisability of the findings might be limited. Besides, this study is using only one product category, and customers' online purchase intentions may be only partially reflected due to the investigation of self-reports. Practical implications -By learning gender differences, e-tailers and advertisers can better target right consumers and consequently foster more positive attitudes and online purchase intentions. Originality/value -This study presents a thorough understanding on a model of online purchase intentions, and how gender moderates several paths of the model.

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