Grid Middleware and Services: Challenges and Solutions is the eighth volume of the CoreGRID series. The main focus in this book is the Grid middleware and service level agreements. Grid middleware and Grid services are two pillars of grid computing systems and applications. This volume includes sections on knowledge and data management on grids, resource management and scheduling of Grid, Grid information, resource and workflow monitoring services, and service level agreements. Grid Middleware and Services: Challenges and Solutions are designed for the professional audience, composed of researchers and practitioners in the industry.