the.com/quality control
paranoia, systematized and put on a clipboard.
means a system of checks that catches defects before customers do, trading a little speed for a lot of trust.
from formalized in 1920s bell labs by walter shewhart, who realized you could chart defects statistically instead of just eyeballing them; deming later took it to japan and it rebuilt an economy.
six sigmaaims for 3.4 defects per million
toyota andon cordany worker can stop the entire line
deming in japanrejected at home, revered there by 1950
iso 9001over a million companies certified worldwide
for instance
toyota production system — andon cord lets any assembly worker halt production
nasa apollo program — redundant checks after apollo 1 fire killed three astronauts in 1967
fda drug approval — multi-phase trials before any pill reaches a pharmacy
michelin star inspections — anonymous inspectors revisit restaurants multiple times a year