Strategic Environmental Assessment (SEA) is the formalized, systematic, and comprehensive process of evaluating the environmental impacts of a policy, plan or programme and its alternatives, including the preparation of a written report on the findings of that evaluation, and using the findings in publicly accountable decision making. Currently, SEA is applied primarily as a means of minimizing the adverse environmental effects of the implementation of proposed strategic actions. However, its potential shall also be explored as a sustainability development tool. Given the flexible, transparent, participatory nature of the SEA process and procedures, SEA implementation could play a significant capacity building role in a sustainability-driven development process. For the post-Soviet and post-socialist countries surviving the economic pressure of the transitional process and an environmental legacy of unsustainable use of natural resources, SEA, as a preventive planning tool fit for the open market-oriented economy, may become of significant relevance. SEA implementation, especially if developed in a synergism with other tools such as environmental planning, risk assessment and management, and public participation in environmental decision making, may decrease and/or mitigate environmental risks of economic development and enable transitional societies to better meet environmental security and sustainability challenges.