Patent ID: 7206721

Claim:
A system of offline measurement for process tool monitoring applied to semiconductor processes, comprising: a data collection unit, further comprising: a first database, storing predefined monitor rules related to the semiconductor processes; and a second database, storing predefined monitor data related to the semiconductor processes; a process tool, coupled to the data collection unit, implementing offline measurement operations according to selected monitor rules from the first database and selected monitor data from the second database to generate monitor results, wherein the selected monitor data is obtained according to the selected monitor rules; a constraint system, coupled to the data collection unit, retrieving the monitor results, determining whether abnormal states exist by comparing the selected monitor rules and monitor data according to the monitor results, if so, enabling lot processing for the process tool, if not, terminating the lot processing for the process tool, responding with a failure notice, and re-defining the selected monitor rules to update the first database.