This book, which constitutes the tenth volume of the Transactions on Rough Sets series, focuses on a number of research streams that were either directly or indirectly begun by the seminal work on rough sets by Zdzislaw Pawlak.

Rough Set Theory: Ontological Systems, Entailment Relations and Approximation Operators.- Information Entropy and Granulation Co-Entropy of Partitions and Coverings: A Summary.- Lattices with Interior and Closure Operators and Abstract Approximation Spaces.- Rough Approximation Based on Weak q-RIFs.- Rough Geometry and Its Applications in Character Recognition.- Extensions of Information Systems: The Rough Set Perspective.- Intangible Assets in a Polish Telecommunication Sector - Rough Sets Approach.- Multicriteria Attractiveness Evaluation of Decision and Association Rules.

From the reviews:

"One of the main objectives of rough set theory is to find reasonable extensions for rough sets in known techniques and results about sets. ? I highly recommend this book to students and researchers who are already familiar with the basic ideas of rough set theory and want to learn about the latest developments. In principle, the book should also be accessible to other readers with a mathematical background, even if they are not very familiar with rough sets." (V. Kreinovich, ACM Computing Reviews, November, 2010)