This lecture covers the procedures and actors involved in environmental impact studies, focusing on the decision-making process for projects subject to environmental impact assessments. It explains the importance of clarifying the competent authority and the procedures for construction authorization and plan approval. The lecture also delves into the different phases of the environmental impact report, the role of specialized services, and the potential oppositions and appeals that can arise during the process. Additionally, it discusses the significance of engaging with environmental protection organizations and the impact assessment perimeters. The presentation emphasizes the need for clear project presentations, the integration of protective measures, and the consideration of future states with and without the project.