The EIA and SEA systems were included simultaneously in 2006 with the Executive Decree 209. Later in the year 2009, this was repealed with the Executive Decree 123. The EIA is well defined and outlined in the Executive Decree 123, where the steps of classification and presentation of a project that requires environmental approval of the entity are detailed. The SEA is defined as an evaluation process of strategic decision making by the government, such as policies, strategies, plans and programs involving the generation of patterns of activities, whether  economic, social, territorial, consumer, or otherwise, that pose significant environmental effects (Article 2, ED-123).
SEAs and EIAs are directed and supervised by the National Environmental Authority (ANAM), as the state governing body on natural resources and the environment (Article 77, ED-123).