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Design patterns for Service Oriented Architecture (SOA) suggest solutions for architectural, design and implementation problems, but these changes also affect performance and other non-functional properties. A performance model can be generated from a SOA software model (plus some implementation and deployment advice) and used to study these impacts. The paper proposes to propagate the change in the software model due to applying a given pattern into the corresponding change in the performance model by an incremental transformation. The software model and the patterns are described using UML extended with the profiles SoaML (for service-oriented system design) and MARTE (for performance annotations). The application of a pattern is described by application rules specified by the user. Systematic (but not, at this point, automated) incremental transformations are explored and evaluated for effectiveness on case study examples.