10.1. Chapter 10 describes sources of information that were not intended for statistical use and are not covered in chapters 5 through 9 but that, nevertheless, can be used for collecting data needed for measuring the international supply of services. In particular, the chapter presents recommended practices (section A) and describes other data sources and big data (section B), in particular payment cards and mobile phone records. It also covers external party sources (section C) and linked microdata (section D). Each section presents related country experiences.