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Model / Fraassen: represents the worlds which are allowed by the theory - unintended models: e.g. the theory that the center of the solar system may have any constant speed allows different speeds (> class of models) and something else than motions too! - So an empirically adequate theory can go beyond the data. - ((s) > Empirical underdetermination by the data) - problem: then you can still believe that any theory of a family of theories is wrong - and therefore their common part is wrong! - Common part: may be paraphrased as "one of the models of the theories represents the world correctly". - ((s) and this may be wrong!) - common part: is often not empirically important.
B. van Fraassen
The Scientific Image Oxford 1980