Yes, I think I would agree that I wouldn't want us to list all the principles in the act, but some reference to a statement like “commonly accepted principles of aid and development effectiveness” would allow for the constant evolution of those.
There are some standards out there that get developed, they evolve over time, and those would be something that you would draw on. But you don't list them right now in an act, because I would agree those principles evolve over time as we learn more.