Workplace design should fit the variety of workers' shapes and sizes and provide support for the completion of different tasks.
Different tasks require different work surface heights:
Precision work, such as writing or electronic assembly 5 cm above elbow height; elbow support is needed.
Light work, such as assembly line or mechanical jobs about 5-10 cm below elbow height.
Heavy work, demanding downward forces from 20-40 cm below elbow height.