Here is the definition of the day:
A generally recognized rule of thumb that helps to achieve a goal
Find Importants Problem Fast - Testing should be optimised to find important problems fast, rather than attempting to find all problems with equal urgency. For example, you have a systemthat requires 2 week of manual testing for 2 people, do you test everything from top-to-bottom? No - it is smarter to test the most important functionality.