The phenomenon of workplace partnership has attracted significant academic interest. This article uses case study evidence from a traditional heavy engineering MNC context to examine how the pursuit of collaborative strategies affected the roles of a multi-layered, mature community of trade union shop stewards. The analytical lens of legitimacy is used to provide insight into the contrasting experiences of senior and sectional stewards – a hitherto overlooked area. This study suggests limitations at one level of representation may be offset by advances at another and thus aids understanding of the conditions underpinning the impact of partnership.