Published at Saturday, 18 November 2017 by juan in Furniture Office, with total 39 photos.
Then there is the backrest tilt which allows the person using the chair to either recline (lean back) or incline (lean forward) and adopt variable postures in between these two positions. Most people find a slight reclining position to be the most comfortable.
As for armrests, they should not interfere with the work that needs to be done but should be comfortable and provide support for the arms. In general if wide movement is needed armrests should be avoided.
For starters, there is the backrest height. You want to try to find one that will allow the user of the chair to provide maximum support to the lower portion of the back. The height will vary from person to person so that backrest itself must be adjustable.