This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book looks at the response of one local authority — the City of London Corporation — to the changes in planning and building legislation. It discusses how embracing diversity and inclusion from the very start of a major development project – the London 2012 Olympic and Paralympic Games – delivered the ‘most accessible Games ever’. The book also looks at some buildings and building elements that illustrate good inclusive design. It explains some common design pitfalls and some easy things to get right, including some good and bad examples of accessible public realm – the spaces between buildings – as well as some internal building elements. Accessible and inclusive design is frequently considered purely as a regulatory requirement, with meeting minimum standards the sole consideration, resulting in a race to the bottom.