1. The heights of the keyboard and of the computer or terminal.

2. How far the keyboard platform protrudes from the platform on which the computer rests.

3. The tilt of the computer—a useful glare-reducing feature.

4. The angle at which the screen faces you. You can swivel away to your heart’s content to suit your posture or cut back on glare.

5. The height of your chair. You don’t of course need high-tech furniture to do that—just common sense. For a computer operator, says David Eisen of the Newspaper Guild, a straight-back chair can become “a ticket to the orthopedic ward.”

You might also shop for a palm rest and, if you’re short, a leg rest.

An easellike copy holder could help as well.

And so can enough desk surface, shelves, or file cabinets for your paperwork. Why buy a detachable keyboard if you can’t move it around because your desk is too cluttered?

Jon Ryburg, an ergonomics expert with the Facility Management Institute, a Michigan think tank owned by Herman Miller furniture, says computer gear may take up as much as 40 percent of a desktop. And yet does the space requirement for paperwork decline by that percentage? Hardly. So unless you enjoy seeing chairs used as desks, you’d better plan your furniture well.

Not that all improvisation is bad, especially if you’re a professional or small businessman working at home. My Kaypro, for instance, rests atop an old carton from a toy store, and I’ve bought some little gray legs, the color of the case, to tilt the screen back.