Specify The Usable Height Range
A brief that simply requests adjustable height leaves an important detail unresolved: which seat positions must the chair provide? Request the minimum and maximum seat heights for each proposed configuration and compare them with the users and work surfaces involved. Have users operate the control themselves during the assessment, checking whether they can understand and reach it. The selection confirms that the seat can be raised or lowered, but does not establish the range, control design or adjustment method for every chair. Those details belong in the practical comparison.
Test At The Workstation People Will Use
Position the chair at the actual desk or a representative surface with the same relevant dimensions. Ask the user to set the height and perform their normal tasks. Consider the resulting relationship between the seat, work surface and equipment rather than judging adjustment in isolation. Where the chair will move between locations, identify the surfaces it needs to accommodate and assess those arrangements. A suitable setting at one desk does not automatically establish suitability elsewhere. Record any limits so that the chair is assigned to a location whose requirements it can meet.

