6.1. Introduction. The present chapter is based on chapter II of IMTS 2010, entitled “Trade system”. It provides additional information on the definition of statistical territory and its territorial elements. It describes challenges and good practices in the organization of data collection with respect to those elements and in relationship to the general and special trade systems, taking into account the data sources described in chapters II to IV of this Manual, country practices in establishing the legal framework (chap. I) and institutional arrangements (chap. V).