SRM interface, provide a simple disk-based storage model. They are in the process of being phased out. Information service The Information Service (IS) provides information about the WLCG/EGEE Grid resources and their status. This information is essential for the operation of the whole Grid, as it is via the IS that resources are discovered. The published information is also used for monitoring and accounting purposes. Much of the data published to the IS conforms to the GLUE Schema, which defines a common conceptual data model to be used for Grid resource monitoring and discovery. The Information System that is used in gLite 3.1 inherits its main concepts from the Globus Monitoring and Discovery Service (MDS). However, the GRIS and GIIS in MDS has been replaced by the Berkeley Database Information Index (BDII) which is essentially an OpenLDAP server that is updated by an external process. Workload management The purpose of the Workload Management System (WMS) is to accept user jobs, to assign them to the most appropriate Computing Element, to record their status and retrieve their output. The Resource Broker (RB) is the machine where the WMS services run. Jobs to be submitted are described using the Job Description Language (JDL), which specifies, for example, which executable to run and its parameters, files to be moved to and from the Worker Node on which the job is run, input Grid files needed, and any requirements on the CE and the Worker Node. The choice of CE to which the job is sent is made in a process called match-making, which first selects, among all available CEs, those which fulfill the requirements expressed by the user and which are close to specified input Grid files. It then chooses the CE with the highest rank, a quantity derived from the CE status information which expresses the goodness of a CE (typically a function of the numbers of running and queued jobs). The RB locates the Grid input files specified in the job description using a service called the Data Location Interface (DLI), which provides a generic interface to a file catalogue. In this way, the Resource Broker can talk to file catalogs other than LFC (provided that they have a DLI interface). The most recent implementation of the WMS from EGEE allows not only the submission of single jobs, but also collections of jobs (possibly with dependencies between them) in a much