Define What The Arms Must Do
Unstandardised office chairs with armrests should be assessed against a written description of the intended work. Decide where users need support, how closely they must approach the desk and which movements they repeat. This gives the armrest assessment a purpose beyond simply noting that the chair has arms.
Observe the contact between forearms and armrests during representative tasks. Ask participants to explain where support is useful and where it interferes with reaching or turning. Record the working position alongside their comments, because a preference expressed while sitting back may differ from their experience during keyboard work.
Identify The Actual Armrest Arrangement
The presence of armrests does not tell you whether they move or how they are positioned. Check their operation directly and obtain the relevant dimensions. If movement is available, examine its practical use with the intended desk; if not, assess the fixed relationship between arms, seat and working surface.
Use the same questions for every chair: can the user approach the desk, rest the arms comfortably and leave the seat without an awkward movement? Keep observations specific. A note that an armrest catches the desk edge gives more guidance than a broad statement that the chair feels unsuitable.

