Book excerpt: This book describes a broad view of sustainability as a crucial factor for the success of its implementation. Not only the environmental aspects of the sustainable cities ́ development are reviewed but the economic and social aspects of it, as highlighted in the UN Sustainable Development Goal 11 (make cities and human settlements inclusive, safe, resilient and sustainable). Nowadays, researchers, students, and stakeholders are highly involved in sustainability issues. Because of this, they need a guiding document to help them develop and implement sustainability programs at the level of companies and institutions. In this book, the authors discuss and explain basic concepts of sustainability-related to social, economic and environmental aspects, as well as strategies for its implementation.