The book "Potential for Industrial Energy-Efficiency Improvement in the Long Term" offers an in-depth examination of the limits of energy efficiency in industrial processes. It does not forecast what efficiency will look like in the future, but discusses the possibilities for improving energy efficiency in the present and the potential developments of new technologies. The research conducted at the Department of Science, Technology and Society at Utrecht University has produced a comprehensive database of energy-efficient measures that are addressed in this book. This database has sparked new research topics, particularly regarding the barriers to implementing efficiency measures. The book also analyzes historical data, showing that the short-term improvement potential has remained constant over the years and has been supplemented by the introduction of new technologies. These findings raise the question of whether there are ultimately limits to efficiency that take into account both thermodynamic considerations and the development and dissemination of new technologies.