A thoughtful approach to web site quality.
Quality control is a superset of testing, although it often used synonymously with testing.
Roughly, you test to see if something is broken, and with quality control you set limits that say, in effect, if this particular stuff is broken then whatever you're testing fails . Yet another way of looking at the difference between testing and quality control is to consider the difference between a test as an event and a test as a part of a system. For example, let's say our test is the measurement of your ability to assemble a jigsaw puzzle in one hour. We test you today, and you complete the puzzle in fifty-eight minutes, so you pass. Quality control also becomes necessary when the team grows, or you partner with more companies, or your site gets more visitors.