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13.1.            As described in part II, several sources can be used in the compilation of data within the modes of services supply statistical framework. In practice, information from various sources will often have to be combined to obtain the required level of detail and quality, while also reducing excessive burden for respondents. The present chapter reviews the potential challenges compilers face when integrating data sources that cover the same activities or the same entities and provides guidelines on how to resolve those issues. More specifically, the chapter presents a summary of good practices and defines the relevant terminology (section A), and describes the integrated business survey program (section B) and integration, consolidation and merging of data from different sources (section C). A country experience is presented in section D.