Begin With The Handover Between Users
Evaluate Category 2 office chairs with plastic bases by asking users to adjust the chair from a previous person's setup. Watch how readily they identify the functions and reach the controls. Record any feature that needs explanation, along with any adjustment that is absent or unsuitable for the intended task.
This exercise reveals practical differences without assuming that the materials determine usability. Establish a clear handover routine based on the controls actually present. Keep the instructions short enough to use at the desk, and ensure that they describe the particular chair configuration being assessed in the shared area of the office.
Check Clearance In A Working Position
A shared desk still needs to accommodate individual users. Assess the relationship between the seat, work surface and available legroom. Examine the plastic base within that space rather than considering it in isolation. Its material does not establish its footprint, shape or compatibility with the arrangement beneath the desk itself.
Ask each participant to approach the workstation, sit down and leave it again. If armrests are present, check their interaction with the desk edge. Observe the complete movement sequence, because a chair can meet a written material requirement while still requiring changes to the surrounding workstation layout for comfortable daily access.

