The Planning Commission played a crucial role in the type of development that India followed after independence. However, even though most economic analyses of India mention the five-year plans, the Planning Commission as an institution remains little studied. This is why this book proposes to look backward, examining the history of the idea of planning and the history and experience of planning in India. It also looks forward, trying to evaluate, beyond ideologies, which role the practice of planning has and should have in contemporary India. It then proposes that the NITI Aayog, the think tank founded on 1st January 2015 after the demise of the Planning Commission, could learn from this experience. This book addresses three leading questions: why plan economic development? How to plan? And what exactly can/should be planned? These questions are interrelated and the contributors of this volume, each with their own focus, propose elements of replies.