Furthermore, the six LPI components are mapped into two main categories. The first category involves indicators related to areas for policy regulation as input to the supply chain (e.g., customs, infrastructure, services), while the second pertains to supply chain performance outcomes (e.g., timeliness, cost, reliability). The components were chosen based on recent theoretical and empirical research and on the practical experience of logistics professionals involved in international freight forwarding. The study also includes a set of domestic performance indicators for 143 countries. For these data, survey respondents assess the logistics environments in the countries where they work, providing information on the quality of infrastructure, the performance of core services, the friendliness of trade clearance procedures and the time, cost and reliability of import and export supply chains. These domestic indicators help to define logistics constraints within countries, not only at the gateways, such as ports or borders. They analyse the major determinants of overall logistics performance, focusing on country performance in the major determinants of overall logistics performance: infrastructure, services, border procedures and time, and supply chain reliability. The LPI uses standard statistical techniques to aggregate the data into a single indicator. This single indicator can be used to compare countries, regions, and income groups.