This article introduces the notion of agreement patterns, which provide a framework for modelling reusable problem solution descriptions for agreement fulfilment. In particular, the Provider Selection pattern has been identified for modelling the common problem of selecting a provider by a service consumer. The article presents the pattern structure as well as the reusable domain model and cognitive structures. Agreement patterns aim at providing reusable patterns useful for developers in multidisciplinary areas, such as Agent Technology and Service Oriented Computing.