It meant also informing the men each day just what they had done the day before and just what they were to do that day. In order to do that, as each man came in the morning, he had to reach his hand up to a pigeonhole (most of them could not read or write, but they could all find their pigeonholes) and take out two slips of paper. One was a yellow slip and one was a white slip. If they found the yellow slip, those men who could read and write knew perfectly well what it meant; it was just the general information: “Yesterday you did not earn the money that a first‐class man ought to earn. We want you to earn at least 60 per cent beyond what other laborers are paid around Bethlehem. You failed to earn that much yesterday; there is something wrong” — Frederick W. Taylor.