Primary considerations:
- Does your writing surface have a rounded leading edge?
- When seated upright, is the worksurface height approximately midway between your navel (belly button) and the bottom of your sternum (breastbone)?
The ergonomist's opinion:
- It’s best to key (whether at a keyboard or with a calculator) and write at separate heights.
- If separate surfaces are not practical (forcing you to key and write at one height), selecting an intermediate height may be acceptable in some cases.