Commonly percentiles are used to define users’ bodily dimensions. The percentile approach is however not suitable for multivariate problems such as the design of car cockpits, i.e. where a range of body segment dimensions affects the design. An alternative way is to use a set, afamily, of manikins for evaluation that better represents human variety. The aim of this study was to compare seat and steering wheel adjustment ranges obtained when using manikin families or a percentile approach as the user representation in human simulation software. Results obtained indicate that a more elaborate and careful consideration of users can be achieved when using a manikin family approach for human accommodation compared to apercentile approach.