Table 2.10.

Factors for judgment in determining the frequency of reassessment and monitoring

Factors for judgment	Typical contents
*Includes the reliability of: the control class determined previously, the results of the current assessment and monitoring, and the fact that the control class will be continued in future.
1) Initial (previous) control class	-
2) Factors related to exposure risk
(i) Degree of toxicity of substances to be handled	Toxicity (carcinogenicity), occupational exposure limit, etc.
(ii) Reliability of control class (*)	Level of skill and experience of risk assessment supervisor
	Measurement accuracy (number of samples, monitoring duration)
	Number of times of past monitoring (accumulation of data)
	Quality and quantity of referred alternatives (results of similar SEG)
	Effectiveness of equipment measures (local exhaust ventilation equipment, etc.)
	Amount of substances to be handled (trace amounts)
	Volatility of substances to be handled (very low), etc.