The article reviews two books: one by Cueto and another by Amaury Lélis Da-Fabbro. Cueto's book highlights the historical significance of the Pan American Health Organization (PAHO) in improving the health standards of Latin America and emphasizes the importance of institutional history in health planning. The second book, "Adherence to Long Term Therapies: Evidence for Action," is part of a global initiative by the World Health Organization (WHO) aimed at improving adherence to long-term therapies for chronic diseases. It provides a comprehensive guide for health policymakers, detailing the dimensions affecting adherence, the impact of low adherence, and strategies to improve it. The book covers various chronic diseases and offers practical interventions and economic benefits of improved adherence. Both books are valuable resources for professionals in health and policy, offering insights into improving health outcomes and addressing global health challenges.The article reviews two books: one by Cueto and another by Amaury Lélis Da-Fabbro. Cueto's book highlights the historical significance of the Pan American Health Organization (PAHO) in improving the health standards of Latin America and emphasizes the importance of institutional history in health planning. The second book, "Adherence to Long Term Therapies: Evidence for Action," is part of a global initiative by the World Health Organization (WHO) aimed at improving adherence to long-term therapies for chronic diseases. It provides a comprehensive guide for health policymakers, detailing the dimensions affecting adherence, the impact of low adherence, and strategies to improve it. The book covers various chronic diseases and offers practical interventions and economic benefits of improved adherence. Both books are valuable resources for professionals in health and policy, offering insights into improving health outcomes and addressing global health challenges.