This law defines the rules, procedures, deadlines, rights and obligations:
a) for identifying and evaluating the direct and indirect impacts of the project or activity on the environment where they are being implemented;
b) for comparing advantages and gaps of a project, proposing new options, with changes on:
i) the project site;
ii) values and capacity;
iii) technology
iv) comparing with the no-alternative option ;
v) definition of measures for prevention and mitigation of environmental impacts;
c) to ensure a qualitative technical, professional, juridicial and administrative review and decision-making by respective authorities

This law aims to ensure:
a) the general, integrated and timely evaluation of environmental impacts, of projects and activities that are going to be implemented, by preventing and mitigating negative impacts on the environment;
b) a process of open evaluation and unbiassed administration, through participation of central and local authorities, general public, NGO's, project proposer and physical and juridicial persons specialized in this area.