Findings -We identify and discuss the importance of 10 roles played by IPOs and 12 required resources/capabilities. Furthermore, considering the changes that occurred to these IPOs over a five-year period (2007-2012), we observe three distinct evolutionary behaviours (i.e. 'overall development', 'selective development', and 'stable configuration') and highlight three contingent factors that jointly affect these behaviours (i.e. the architectural and technological complexity of the sourced items, annual volume sourced abroad, and experience in the foreign context).Originality/value -This paper contributes to the resource-based view of the firm in a global sourcing context by highlighting the resources/capabilities required by IPOs and discussing their characteristics. Furthermore, it proposes a typology of IPO micro-organisational evolutionary behaviours. Finally, it applies contingency theory and identifies three factors that might affect the evolutionary behaviours.