A Simulation Model for Machine Efficiency Improvement Using Reliability Centered Maintenance: Case Study of Semiconductor Factory

Table 2

Occurrence evaluation criteria.

Effect	Ranking	Criteria: likely failure rate
Very high: persistent failures	10	Every hour
	9	Every shift
High: frequent failures	8	Every day
	7	Every week
Moderate: occasional failures	6	Every month
	5	Every 3 months
	4	Every 6 months
Low: relatively few failures	3	Every year
	2	Every 2 years
Remote: failure is unlikely	1	Every 5 years