 Another argument for the conclusion that disabilities entail setbacks to well-being is suggested by the human variation model (Scotch and Shriner 1997). This treats disabilities not as a distinct category, but as conditions falling on a continuum of physical or mental difference. It is not intrinsically disadvantageous to be near the end of such a continuum but may be disadvantageous in a society in which only a small proportion of people fall near that end. This is because many of the physical structures and social practices of that society will inevitably be designed for its average members. No matter how just a society, how committed to inclusion, there would still be some disadvantage in being toward the end of the spectrum. There may be some truth to this claim, but it is easy to overstate. Universal design advocates argue that it is, or will become, feasible to build structures and practices that fully or equally accommodate individuals across large ranges of human variation. Even if their claims are also overstated, they suggest a need for caution in concluding that minority status is intrinsically disadvantageous.