1. Rapid technological advances in the past few decades in transport, computing and telecommunications, including the development of the Internet and electronic commerce, have allowed enterprises to avail themselves of resources for production at more distant locations than ever before and have enabled them to import or export services from ever wider markets. This trend towards globalization, reinforced by liberalization policies and the removal of regulatory obstacles to economic activities, has fuelled the steady growth of multinational enterprises, international investment and trade in goods and services. Better communication and transport have also facilitated the movement of people for the purposes of tourism, migration, employment and trade. The result has been a growing economic interdependency among countries, be it through international trade, multinational enterprises, global value chains or the outsourcing of business functions. Particularly in the field of trade in services, which are increasingly becoming the focus of trade liberalization agreements, market access deregulation and other policy initiatives, statisticians face a growing challenge to produce statistics that measure these complex global transactions in a clear, accurate and timely manner.
2. The services sector accounts for the largest share of business activity, employment and economic growth in most economies, yet the role of services trade, particularly in designing policies and negotiating regional agreements, continues to be poorly understood. A major reason for this disconnect is the absence of abundant, high-quality data on trade in services that is comparable across economies, making it difficult to measure the impact of services trade on the economy and provide useful information for negotiators and policymakers to open up market access or develop policy tools to facilitate trade in services.
3. In that context, the Statistical Commission adopted of the United Nations, in 2010 at its forty-first session, the Manual on Statistics of International Trade in Services 2010 (MSITS 2010) and endorsed the implementation plan, while urging the Task Force on Statistics of International Trade in Services (TFSITS) to give high importance to the development of corresponding compilation guidance. To ensure close coordination with the work of the International Monetary Fund (IMF) on the compilation guidance for the Balance of Payments and International Investment Position Manual, 6th ed. (BPM6), the work on the Compiler's Guide for MSITS 2010 started late in 2011 with the support of a United Nations Expert Group established for that purpose. The Compiler's Guide aims to help compilers while remaining consistent with the recommendations of MSITS 2010, as well as with related statistical recommendations and the compilation guidance that has been developed for BPM6.
4. The Compiler's Guide serves the purpose of harmonizing and improving the ways in which statisticians at the national level collect, compile and disseminate statistics of international trade in services. The aim is to increase the availability and quality of such statistics in order to fulfill the urgent needs and demands for statistics that reflect modalities through which services may be supplied by policymakers, researchers, market analysts and the public in general. While the international standard in economic statistics of the 2008 System of National Accounts (2008 SNA) and BPM6 are in the process of being implemented, the Compiler's Guide is meant to provide the statistical community with guidelines, best practices, case studies and practical advice on the compilation of data in compliance with the MSITS 2010 framework for the compilation of statistics on the international supply of services.
 See Official Records of the Economic and Social Council, 2010, Supplement No. 24 (E/2010/24), chap. I. B, decision 41/104, para (b).
 IMF, BPM6 Compilation Guide: Companion Document to the Sixth Edition of the Balance of Payments and International Investment Position Manual (Washington, D.C., 2014).
 System of National Accounts 2008, (2008 SNA) Studies in Methods, Series F, No. 2/Rev.5 (United Nations publication, Sales No. E.08.XVII.29).