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The paper develops a network-based mapping of the technological positions of the firms in an industry and applies this model in a longitudinal study of the formation of alliances between organizations. In the analysis, the positions of high-technology firms in their competitive environment are stratified on two dimensions: crowding and prestige. Organizations in crowded positions are those that participate in technological segments in which many firms actively innovate, and prestigious firms are those with a track record of developing seminal inventions. The study's principal empirical findings are that firms in crowded positions and those with high prestige form alliances at the highest rates. The statistical analyses, performed on a sample of semiconductor firms during a six-year period, demonstrate that crowding and prestige predict alliance formations at the firm level (which organizations establish the greatest …