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ABSTRACT
To study production risks In a prehistoric technology, this paper presents an event tree analysis (ETA) of microblade technology at Paleolithic sites from north central Honshu, Japan. ETA reconstructs the sequence of steps involved in making micro-cores and determines the points and rates at which cores failed. The analysis identifies production characteristics of the two assemblages and shows that, although production risks were present, they added little to the overall cost of microblades and associated Implements.