Summary: This study sets out to investigate the potential differences between social workers using voice- or silence strategies in their experience of organisational resources, attitudes and health, and whether social workers moving between strategies (voice or silence) over time have a different experience of the same outcomes than those who stay with the same strategy group. The participating social workers (n = 1356) responded to two web-based questionnaires over a one-year period. Findings: The results show that voice strategies are related to the experience of more positive organisational resources, more positive attitudes (greater job satisfaction and organisational commitment, but lower intention to exit) and more positive health (greater recovery, but less emotional exhaustion and stress symptoms) than those using silence strategies. The results also show that moving from silence to voice is related to the experience of increased organisational resources, more positive attitudes and more positive health at T2, while those moving from voice to silence reported the opposite. Applications: The longitudinal approach applied in this study adds empirical evidence of the relationship between voice/silence and work-related attitudes, as well as health and well-being. The close relationship between organisational resources, employee voice behaviour and related individual outcomes regarding attitudes and health imply that Human Resources (HR) management has a lot to gain by developing and securing a voice-friendly and considerate climate in their organisations. [ABSTRACT FROM AUTHOR]