To stick or not to stick?

Let's say you're trying something that isn't working right now.

How do you decide whether to stick with it or to move on to a different method?

Some tactics work fine, just not right away. So there's a risk of quitting too soon.

Other tactics will never work. It's best to try something else quickly.

But you often can't tell right away which is which. So, how do you decide?

Yours,

— Peter