Table 1.

REFA classification of workload

Grade	Work intensity	Example
0	Work without special physical strain	Work without load like, for example, desk work
1	Work with small physical strain	Handling light work pieces; also lengthy standing or walking around
2	Work with moderate physical strain	Handling of 1–3 kg control device; carrying loads of 10–15 kg; climbing stairs or ladders without load
3	Work with hard physical strain	Carrying loads of 20–30 kg, shovelling, digging, chipping, climbing stairs or ladders with moderate load, moderate work in tense work posture
4	Work with most heavily physical strain	Carrying loads of more than 50 kg, climbing with heavy load, hard work in tense work posture