In this introductory chapter, we explain the application of the capability approach (CA) to the work domain. Sen, the founder of the CA, argues that justice and well-being can best be expressed in terms of capabilities. Capabilities are the possibilities or freedoms people have to realise ‘doings and beings they have reason to value’. Our view in this book is that if workers can realise this in their work, then people can be who they want to do the things that add value for themselves and their working environment. This contributes to well-being and flourishing at work. Sen’s starting point from practical situations fits well with work where improvements also occur from the actual context of that work. Concepts such as diversity, contextuality, and inclusivity, which are important aspects of the CA, are also crucial for work where everyone can flourish. The theories and conceptions that are relevant to the foundation and positioning of the approach are briefly discussed. The chapter starts with an anecdote from Sir Christopher Wren, which serves as a metaphor for the topics discussed in the chapter and the book as a whole. The chapter ends with a brief overview of the book.