Patent ID: 7062409

Claim:
A system for detecting failure of manufacturing apparatuses, comprising: a low-yield detecting portion which identifies a low-yield-period apparatus having a significantly lower yield period compared with other manufacturing apparatus and the significantly lower yield period by comparing yields of a plurality of manufacturing apparatuses used in parallel in a specific manufacturing process for each time period when the manufacturing apparatuses were used; a downward-tendency detecting portion which identifies a downward-tendency apparatus having a significant downward tendency in yield compared with the other manufacturing apparatus by comparing recent yield trends of the plurality of manufacturing apparatuses; a warning issuing portion which issues multi-level warnings to the low-yield-period apparatus and the downward-tendency apparatus; and a yield data storing portion which stores yield data of the plurality of manufacturing apparatuses for each time period when the manufacturing apparatuses were used, wherein the yield data includes at least one of a good product rate of finished products having experienced a series of manufacturing processes including the specific manufacturing process, a good product rate in the specific manufacturing process, a characteristic numerical quantity representing a distribution of defectives in a wafer surface of a semiconductor wafer processed by one of the manufacturing apparatuses as a processed object, and a characteristic numerical quantity representing a distribution of yields in one lot of a group of objects processed by one of the manufacturing apparatuses.