To understand what makes a chair comfortable or practical we need to test a large
number of chairs, both good and bad. Due to the numbers involved we cannot achieve
this with physical testing. Instead we use simpli ed ergonomic simulations. The sim-
ulations presented here produce pressure maps within the range given the literature,
along with several other measures of comfort and practicality. This was done sub-
stantially faster than examples in the literature, permitting collection of thousands of
results.