In studying the factors which go into the satisfaction of working groups, social scientists have isolated four major areas: The material rewards and … - Gerald M. Weinberg

Good testing involves balancing the need to mitigate risk against the risk of trying to gather too much information.

Or, suppose you want to motivate your managers to ship products on time, so you conspicuously promote each manager whose product goes out the door on schedule. All goes as planned until the situation arises in which one of your managers has a project where the testers are reporting numerous problems. Because managers who have shipped products on time have been promoted, this manager thinks, I want that promotion so I need to ship this on time, but those bug reports are getting in the way. I know what I'll do! I'll put the testers on another project until the developers have a chance to catch up.

If a program doesn’t work, measures of efficiency, of adaptability, or of cost of production have no meaning.