Table 3. Action levels relating to the score by OWAS, RULA and REBA.

Action level	OWAS	Score		Action
		RULA	REBA
0	n/a	n/a	1	not required
1	Cross-check	1∼2	2∼3	not or may be required
2	Cross-check	3∼4	4∼7	required
3	Cross-check	5∼6	8∼10	may be required in future
4	Cross-check	7 <	11∼15	required immediately