Such properties can be used to determine the best rules to use under given circumstances.

The process of choosing a best rule is called conflict resolution.

The best rules were the ones designed to keep goals from being declared an endangered species.

The best rule here is the spy's favorite - a good agent will get lost in a crowd of one.

Still, even the best parental rules have a way of being broken.

The best rule of thumb is to call ahead.

"The best rule of thumb is to choose a middle road," she said.

The best rule, however, is to keep your eyes open.

Do this: The best rule of thumb is to take only a 30-second break between sets (meaning you'll need a watch with a second hand).

To a man's eye, the best rule of thumb is short.