Patent ID: 7117058

Claim:
An apparatus of automatic statistical process control (SPC) chart generation, comprising: a storage device capable of storing a chamber management tree, a recipe window management tree, a parameter configuration table and a plurality of chart profile records, wherein the chamber management tree stores a relationship between at least two of tool type, processing tool and tool chamber, the recipe window management tree stores a relationship between at least two of tool type, recipe, and sampling window, and the parameter configuration table stores information indicating which statistical algorithms are applied in the entire process, recipe or tool chamber for each of a plurality of process parameters; and a data acquisition module, acquiring a plurality of process events and a plurality of parameter values corresponding to the process events and the process parameters, selecting the statistical algorithm for the parameter values according to the chamber management tree, the recipe window management tree and the parameter configuration table, calculating a statistical value by applying the statistical algorithm to the parameter values, creating a new chart profile record and a first parameter statistics record linked to the new chart profile record if the chart profile record corresponding to the process events and the process parameters is absent, and storing the statistical values in the first parameter statistic record.