Use The Assigned User As The Reference
For an individual workstation, begin with the employee's normal seated position and daily activities. Fixed-depth office chairs with armrests should be tested by the person expected to use them regularly. Ask them to work at the desk rather than judge the chair in an open area. Watch whether they remain in contact with the backrest or repeatedly move towards the seat edge. Their explanation matters alongside observation: ask about thigh support, contact behind the knees and ease of reaching equipment. Record these points before discussing armrest details, so a seat-depth mismatch remains clearly identified.
Compare Dimensions Through Seated Experience
Seat measurements can support a comparison, but their significance comes from how the person uses the seat. Check the usable front-to-back space and observe how much of it the employee occupies while using the backrest. Do not assume a deeper seat is preferable or that a shorter one will suit every smaller user. Office chairs with no depth adjustment require the existing dimension to work for the individual. Include a period of ordinary work, because someone may initially hold a position that they do not maintain during typing, reading or changes between desk activities.

