This document discusses service adaptation as a maintenance process for service-based applications. It presents research that identified adaptation activities from literature and mapped them to the S-Cube lifecycle to create an adaptation process model. The research conducted a systematic literature review of service-based application development processes, identified those that support adaptation, and developed a process reference model for adapting service-based applications based on data analysis and an expert opinion survey. The model was initially validated and will require further validation. The document concludes that existing approaches often do not address adaptation and traditional maintenance practices can be used when developing adaptable service-based applications.