From the reviews: "This volume is the second of two volumes of papers published in his memory after his death in 2006. It contains 30 papers covering theory and the application of rough sets contributed by colleagues, former students, and collaborators around the world. ... Each of the chapters has its own list of references. The style of writing is at a very sophisticated level. ... this volume is written for specialists in the theory and applications of rough sets." (Anthony J. Duben, ACM Computing Reviews, January, 2013)