||Theories of evolutionary economics have developed concepts of routines for both operational and innovative activities, indicating the extent to which such routines shape the trajectories of technological change. However, the concept of innovative routines has primarily been illustrated with examples from manufacturing, and little is known about its relevance for innovation processes in services. This paper examines innovation in engineering consultancy, in order to identify the role and nature of innovative routines for a knowledge-intensive business service. It is concluded that it is difficult to distinguish operational routines from innovative routines in engineering design services. Moreover, innovative routines are contingent on the institutional context of engineering consultancy business and, in particular, on the effects of widespread use of information and communication technologies.