I am now going to go "out on a limb" and maximize my chances of looking stupid (if just because of omissions or editorial errors): (these standards are not meant to be unrealistic):
Overview: If you cannot unambiguously show key, directly observable proximate causes indicating the clear (and, as far as you know certain) relevance of concepts in your theory _AND_ also show the present setting clearly addressed by your theory, _AND_ show the specific results predicted HERE by your theory: then the theory should be abandoned.
To try to be a bit more specific: (also, you will note that different statements below address different portions of ALL that must be present):
In the brief overview summary above, there are issues of proximate [(real, direct, observable)] causes, ALWAYS ONE OF WHICH AT ANY POINT IS REQUIRED: one or more specific (and specified) thing(s) causal of/for another _OR_ mechanisms possible AND seemingly objectively explainable from previous clear* direct observations and/or present observations _*AND*_ (in either case) presently associated with some key 'triggering' observable(s); _OR_, minimally, one or more specific, clear* thing(s) at least invariably associated with another *_AND_* THIS minimum WITH with clear empirical (testable) hypotheses for discovering more about ALL of these external and internal factors cited as involved -- with the clear goal of yielding a good theory (as described above and below). (Having predicted effects is addressed in the statements below.)[ * FOOTNOTE: 'clear' means proven, as always understood in the same way, as can be shown with excellent inter-rater reliabilities. ]
If it is because the theory cannot, in ANY given context where it is necessarily relevant, show the hypothesized specific, directly-observable predictions, then it is wrong (bad theory). And/OR, if clear specific behavior(s) or pattern(s) of directly observable behavior which are necessarily in-line with the conceptualizations of the theory OR if the theory's specified consequences supposed to be present cannot be directly shown, both as when (in the flow of behavior) and as where (given specific, and specified, environmental features) they are supposed to occur, then the theory is wrong. If the actual (demonstrable and observably-proven) processes involved in building-up the conceptualizations in the theory (i.e. the how of the coming-to-be of the theory) cannot be indicated (at least that which is necessary SHOWN during closely related observable development specified) the theory is wrong. If related processes triggering the functioning of the related products of the theory cannot be shown in directly observable behavior (were/when) predicted and having the predicted effects, then the theory is wrong.
ANY ONE of these is/are enough to be fatal flaw(s) of a theory and indicate bad theory.
Obviously, if because of how it is built-up and/or because otherwise there is nothing without ambiguity, it is obviously built up wrong and it is wrong (bad theory). Very bad. (This kind of case is only particularly noted only because it does not infrequently occur -- it clearly includes more than one of the fatal flaws.)