Patent ID: 7463941

Claim:
A quality control system comprising: a quality control value storage unit configured to store quality control actual measurements of past lots of wafers; a data acquisition device configured to acquire device internal information of a processing device that processes an intended lot constituted of a plurality of wafers, the device internal information including a parameter of processing the intended lot; a device internal information storage unit configured to store the device internal information; a recipe storage unit configured to store a plurality of recipes, each recipe having a mutually different distribution of sampling density within a wafer; a quality control value prediction unit configured to read the acquired device internal information from the device internal information storage unit, read the quality control actual measurements of past lots from the quality control value storage unit, and predict a quality control prediction value of the intended lot based on the acquired device internal information and the quality control actual measurements; a wafer determination unit configured to determine a sample wafer to be measured from among the plurality of wafers constituting the intended lot based on the predicted quality control prediction value; a recipe selection unit configured to read the plurality of recipes from the recipe storage unit and to select an application recipe to be applied to the sample wafer from among the plurality of recipes using the quality control prediction value; and a measurement device configured to use the application recipe to make a quality control measurement on the sample wafer and to store a measurement result in the quality control value storage unit.