When and why do central employees speak up? An examination of mediating and moderating variables.

We examined the proposition that employees' work-flow centrality (i.e., the extent to which they are critical to the task-related interaction networks of their work groups) enhances their personal influence within their work groups and, therefore, motivates them to engage in voice behaviors. In support of this proposition, in a study of 184 bank employees nested within 42 work groups, we found that employees' work-flow centrality was positively related to voice behaviors, with their personal influence mediating this relationship. Further, work-flow centrality was more strongly related to personal influence when employees had higher task performance, and personal influence was more strongly related to voice behaviors when employees had higher levels of work-group identification. Implications for theory and practice are discussed.

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