In the context of systematic reviews, statistical meta-analysis of findings is not always possible. Where this is the case, or where a review of implementation evidence is required, narrative synthesis of data is typically undertaken. Drawing on recently developed guidance aimed at those undertaking data synthesis - and information on the implementation of domestic smoke detectors - we present findings from a demonstration of the tools and techniques that can be used in a narrative synthesis. The work demonstrates how this process can be made more transparent and suggests that using the tools and techniques can improve the quality of narrative synthesis. © The Policy Press.