Abstract
This paper describes a model of the kinesthetic aspect of spatial habitability which is being developed for NASA as a means of assessing the volumetric requirements for the space station. The quantitative model, called ISOKIN, defines the level and type of constraint that a confining space imposes on its occupant. An activity will be constrained either in the ways it can be performed (that is, performer adaption may be required) or in the positions where it can be performed (no adaption required). This model provides both the analyst and the designer the means to operationalize and measure formerly intuitive notions about the suitability of various proposed space station internal configurations for the activities being planned for them.
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