This study, conducted over a one-year period, examined the collaboration practices in a large-scale school-university capacity-building collaborative action research project that was designed to help English language teachers develop the skills needed to deal with the reforms to assessment practices in Hong Kong's school curriculum. The study theorized collaboration as a complex construction that must be understood in the context of the prevailing ideologies shaping professional development practices for teachers. Online data generated from the collaborative action research project were analysed to explore the discursive construction of interpersonal relationships. Critical discourse analysis was used to examine the discursive strategies that were used in the emails of two university researchers and two school teachers to negotiate and manage collaboration practices. It examined the complexities of negotiating collaboration as a social practice in institutional cultures in a non-Western sociocultural setting. The implications of the findings for policy, professional development and future research are discussed.