In the mid 1990’s, the Korean government introduced the Semi-Agricultural Zone System in order to increase land supply, however, the system created a serious social problem - unplanned development of urban peripheries, most of which are non-urban areas. To address this problem, in 2002, the 「Act on Planning and Use of National Territory」was established, and the Land Suitability Assessment System (LSAS) was introduced. The Act intends to prevent unplanned development of non-urban areas and facilitate environment-friendly management of the national land. Under the Act, the Urban Management Plan has been established, allowing non-urban areas to be developed in a planned manner, and land suitability assessment executed to complete the plan. The LSAS provides basic information required for establishing the Urban Management Plan, it categorizes the land into several classes based on the comprehensive evaluation of a land upon its physical and spatial features along with the characteristics of its surrounding areas. Then it determines the possibility of development, or necessity for conservation of the land. The theoretical study on the LSAS including the methodologies was initiated by the Korea Research Institute for Human Settlements in 2001. In 2002, concrete assessment methods and assessment criteria, such as calculation of assessment criteria by land suitability assessment indices, were established. Based on this study, the guidelines for land suitability assessment were established in December 2002, and went into effect on January 1, 2003. It is expected that this English version of the report on the LSAS, developed by the institute and currently utilized nationwide in Korea, will introduce the system to overseas scholars and experts in the relevant fields, helping them ‘smartly’ control urban growth based on the methods for constructing a scientific basic data suggested in the report.