Is there a word or phrase, describing how an educator might "lie" about something, to help students understand a new concept?
I mean this in a generally positive sense. For example, the Rutherford model with electrons orbiting an atomic nucleus would be a gross oversimplification to a particle physicist, but just within reach of an elementary school science class. Or a math teacher might simply say "you can't take the square root of a negative number" when it's actually more complex than that.
I mistakenly thought that "didactic fiction" was such a term, but apparently that term is more meant to describe a genre of "ancient Greek edutainment", rather than an instructional tactic.