ratio that shows the relationship between semiconductor orders and billings. A
book-to-bill of 1.28 means that $128 worth of new orders were received for
every $100 of product billed for the month. A San Jose, California-based trade
association, the Semiconductor Equipment and Materials International (SEMI),
reports book-to-bill data monthly for North America using three-month moving
averages. Companies in the semiconductor industry often release their own
book-to-bill ratios. The statistic is widely watched in the technology market
to judge how well semiconductor companies are performing.