Patent ID: 6898539

Claim:
A method for analyzing final test parameters, the method being utilized for analyzing a plurality of product lots, each of the plurality product lots having a lot number, the plurality of product lots being fabricated through a plurality of equipment, a wafer in each product lot being tested according to a plurality of final test items to generate a plurality of final test parameters, the final test items, the final test parameters, and a packaging process step correlated to the final test items being stored in a database, the method comprising: retrieving the final test parameters of the plurality of product lots by searching the database; comparing the final test parameters to select a representative final test parameter and a corresponding representative final test item; determining if the representative final test item is correlated to the packaging process step; classifying the plurality of product lots into at least two first groups according to their test parameters of the representative final test item if the representative final test item is determined as correlating to the packaging process step, the first product groups comprising a first qualified group and a first failed group; searching for the equipment through which the first qualified group had passed in the packaging process step; searching for the equipment through which the first failed group had passed in the packaging process step; and determining the equipment having a plurality of having processed the first failed group greater than probability of having processed the first qualified group.