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The ultimate goal of meteorite classification is to group together all specimens that share a common origin on a single, identifiable "parent body". This could be a planet, asteroid, moon, or other current solar system object, or one that existed some time in the past (e.g. a now-shattered asteroid). However, with a few exceptions, this goal is beyond the reach of current science, mostly because we have inadequate information about the nature of most solar system bodies (especially asteroids and comets) to achieve such a classification. Instead, modern meteorite classification relies on placing specimens into "groups" in which all members share certain key physical, chemical, isotopic, and mineralogical properties that are consistent with a common origin on a single parent body, even if we do not know what that body may be. Unfortunately, it is possible that several meteorite groups classified in this way may come from a single, heterogeneous parent body or that a single group may contain members that came from a variety of very similar, but distinct parent bodies. As such information comes to light, the classification system will most likely evolve.