Overview
Why do we come up with houserules? Because there’s some kind of problem. Maybe not everyone sees it as a problem, but that’s oftentimes just because people have learned to live with it and be complacent with a deficiency that could be fixed.
How do we come up with houserules? We 1) identify the sources of the problems and 2) identify the results we would like to see instead. Creating a rule is creating the “cause” in a cause-and-effect relationship. In order to know what cause you should aim for, you need to know what effect you’re after.
What do we do with houserules? We test them out and explore their full implications. We look for vulnerabilities that could be exploited. We try to break them. We consider some unintended consequences. We try to think of ways it could interact with other game elements. We playtest it. We adapt it. We eventually figure out the best ruling possible. Maybe it’s a refined version of the houserule, or maybe its the RPG’s original ruling after all.