Described is base arrangement (300), which mainly comprises a lifting structure (310), a base frame (340), a joint pin in the frame (330), a double joint in the lifting structure (320) and a lifting device (01c); on the other hand, the invention includes a seat arrangement (200), which comprises an armrest support (240a and 240b), an arm rest (260a or 260b), an armrest extension (250a and 250b), a seat plate (210), a joint pin in the seat (230), a lifting device (01b), a seat fork (220) and a sliding mechanisms (02a and 02b); finally, the invention includes a back arrangement (100), which comprises a head element (110), a head arm (120), head arm supports (130), a back plate (140), a positioning mechanism (180a and 180b), a back support (150), a base for a back abatable system (190), an abatable back fork (160), a lifting device (01a) and joint pin in the back fork (170); the whole elements are essential for operating the inventive Didactic tool for determining ergonomic specification s in the design of furniture with a seat.
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