The use of a permit system is a simple yet effective way to minimize the occurrence of fiber release episodes. The system is used primarily for controlling maintenance activities which may disturb ACM. In this system all requests for maintenance and renovation activities are given to the designated asbestos program manager. This person, who is designated by the owner, checks all records which are available and concludes whether or not the activity would disturb ACM. If ACM is going to be disturbed, special work practices must be followed after the permit is issued.