Abstract
While Strategic Environmental Assessment (SEA) is one of the sustainable development tools and is considered to be effective for recognizing the needs of projects for the public welfare, Japan has not developed a full-dress SEA system, yet. In order to obtain useful learnings on an SEA system, this research aimed to analyze the characteristics of SEA in the statutory development planning system in England, and examined the contexts of town and country planning and environmental consideration system, such as environmental assessment, for finding out the possible reasons for the qualified characteristic of the SEA system.