Classification of Seating Postures

A classification of seating postures is necessary for a systemic approach in chair ergonomics. The methodology used criteria differentiating and grouping variants into categories. Morphological (hip flexion, trunk inclination, lumbar lordosis, muscular involvement), functional (the relationship with working areas), cultural (conventional unconventional) were brought discussion arguments validation. Each valid criterion describes, by its degree expression, two Cases particular interest found, when or more behave interdependently. combined categories, defined several criteria, to build up classification. Discussions resumed conventions described multi-criteria