This publication contains the Revised Guidelines which have been developed as a tool for the consistent practical implementation of transboundary environmental impact assessment procedures and to assist Central Asian countries in developing their national legislation in accordance with the Convention. The Revised Guidelines are structured along each of the procedural stages of a transboundary environmental impact assessment procedure that reflects the requirements of the Espoo Convention and are complemented by related good practice recommendations for the application of the Convention in the Central Asian subregional context.