In this contribution two European research projects funded by the European Commission in the framework of the IST programme are introduced. The goal is to present the basic ideas and concepts of the projects “Multi-Agents-based Diagnostic Data Acquisition and Management in Complex Systems (MAGIC)” and “Intelligent Fault Tolerant Control in Integrated Systems (IFATIS)” which both aim at the solution of diagnostic problems but in different respects. While MAGIC is based on a multi-agents-based architecture which integrates all levels in a diagnostic scheme, IFATIS deals with hierarchically structured fault-tolerant control for integrated systems. A wide range of industrial applications is expected for both projects.