This book highlights the notion of Circular Economy under the umbrella of Sustainability because of the widespread momentum it is gaining. Today the whole world is certainly in emergent need of an alternative system to traditional economy which is linear, i.e. make, use and dispose to get rid-off the waste and very important to ensure continuous use of resources, which is possible by the advent of circular economy. A circular economy aims to utilize the resources in use for as long as possible, extract the maximum value from them during use, then recover and regenerate products and materials at the end of each service life vis-à-vis traditional linear model. This book discusses circular economy in terms of assessment with various case studies.