The indicator measures to which extent the states ensure that when a review process is carried out where previously unconsidered environmentally significant issues or circumstances have arisen, the public should be able to participate in any such review process to the extent that circumstances permit.

This indicator is an arithmetic average of expert answers to question on a scale from 0 (worst) to 3 (best): (12.1) To what extent do the laws concerning: environmental impact assessments, pollution control standards and permits, forest concessions, extractive industries, biodiversity and terrestrial protected areas, and environmental policy-making require the State or state agencies to provide for a public review process for decisions relating to the environment if previously unconsidered environmental impacts become apparent?