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Recently, workflow has been employed in pervasive computing systems to orchestrate and provide services to the users. Since pervasive computing systems emphasise context-awareness and adaptability, these two features must be included in the workflow mechanism in order to utilise workflow in pervasive environment. In this paper we present various existing approaches to adaptation in context-aware workflow. These approaches are compared based on the common adaptation characteristics identified from our study. Lastly, we discuss and point out the future challenges of predictive adaptation for context-aware workflows.