Dynamic reconfiguration of Grid-aware applications in ASSIST

Current Grid-aware applications are developed on top of lowlevel libraries by developers who are experts on Grid software implementation. Although some applications have been produced this way, this approach can hardly support the additional complexity to QoS control in real applications. We describe the ASSIST programming environment, showing that it is a suitable basis to capture and cope with many of the desired features for QoS control for the Grid. Grid applications, built as compositions of ASSIST modules, are supported by a hierarchical Application Manager targeting application QoS control