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Increased functionality, increased reliability and reduced system costs have been the driving forces behind silicon integration. However, conventional packaging options are becoming a barrier both technologically and in terms of cost effectiveness to further silicon integration. Multi-chip modules (MCMs) provide a cost effective solution to handling the most advanced of silicon chips while increasing reliability. An example of an automotive system which merits the use of thin film (MCM-D) technology is described. The preferred type of interconnect for this circuit together with the alternatives is discussed, with emphasis on the multi-chip module substrate.