Proactive work behaviour may drive public employees to proactively improve public service quality. This research seeks an insight into the role of discretionary human resource (HR) practices in fostering proactive work behaviour among public employees through the mediation mechanism of affective commitment. The data for the research variables were harvested from public employees and their direct managers from local governments at the district level in Ho Chi Minh City of Vietnam. The research results shed light on the positive association between discretionary HR practices and public employees’ proactive work behaviour, which was mediated by affective commitment. The research results also supported the role of public service motivation (PSM) as an intensifier and abusive supervision as a negative moderator for the effect of discretionary HR practices on affective commitment and proactive work behaviour. Our research model integrates discretionary HRM and proactive work behaviour research streams into public management literature.
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