About the time I started working in the electronics industry was about the time Large Scale Integration (LSI) was developing enough to create successful automated production lines that could produce it. It carried much more circuitry than small and medium scale integrated circuits. And manufacturing LSI circuits was very difficult. I once worked at a temporary job as a secretary, where one of my duties was to calculate the total percentages of successful production on different days, using variable procedures. At each step of processing, some percentage of the "chips" on a wafer of silicon failed. And at the next step, some other percentage failed. At each step, the total percentage of failures of total chips on the original wafer became bigger and bigger. The total percentage of successful chips fabricated might be around one percent, or less, of the original potential chips on the wafer.
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