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This paper describes the cluster analysis technique and how it can be used to support menu interface design for in-vehicle multimedia applications. Cluster analysis and similar types of classifying techniques have proven effective for developing simple menu interfaces. This paper extends the use of the cluster analysis technique to a more complex system that consists of 201 generic functions. These functions are representative of those being incorporated into near-term multimedia products. Study results show promise for using cluster analysis as a tool for incorporating the user's organizational structure into the design of a complex menu architecture. Cluster analysis may also benefit the automotive menu designer by providing a means for partitioning menu tasks into chunkable units that can be easily accessed by the driver in single glances.