Is partly based on the EUI PhD thesis by Caroline de la Porte (2008) - http://hdl.handle.net/1814/10463.This paper adapts and then uses principal–agent (PA) theory to conceptualize and thereafter to analyse the EU-level development of the Open Method of Co-ordination (OMC), a crucial component of the Lisbon Strategy as a ‘governance architecture’. The PA model theorizes the continuous interaction and power struggle between the Commission (‘agent’) and the member states (‘principal’) in the emergence and institutionalization of the OMC. It is innovative for several reasons: first, it acknowledges that the member states and Commission interact in a PA logic prior to a contractual agreement; second, it recognizes that the ‘principal’ does not ...