1-2c New explanations are to be judged by how many more problems can be solved by it

1-2g3a At the limit, new theories create new problems
1-2g3b In short, new theories have to solve more problems than existent ones

1-1c4c You have to start with problems (your problems) to attain better explanations

1-2d You have to know your problem-situation (and your web of ideas) as best as you can to judge the merit of new explanations

RUL3 - Any system should be measured by how much it can help with whatever its output.

New explanations are to be judged by how many more problems they solved and introduced. It has to be consistent with your web of ideas, or they have to solve more than introduced. You have to know your web of ideas.