NEPA - A Study of Effectiveness After 25 Years, prepared in conjunction with NEPA's 25th anniversary, provides a detailed perspective on how the Act has affected federal agency decision making. Among the topics is a summary of how the Act has been implemented, how federal agency performance aligns with the intent of NEPA's framers, reactions from the public, NEPA stakeholders, and federal decision makers, and future challenges with ensuring the Act's continued effectiveness.