This report deals with the introduction into Grid resource allocation of prediction times for the execution of computation tasks and with the resulting changes in the Grid organization with a view to the efficient execution of complex applications. We discuss extensions to the GCM component model to include dynamically measured properties, the services needed to gather and convey the information, and their implementation using the distributed directory service from the XtreemOS project. With such a strategy, it will be possible to realize a full set of traditional market relations and provide a flexible, effective and transparent distribution of resources.