1. A method for detecting a fault condition of a manufacturing process, comprising: a) acquiring data associated with a plurality of manufacturing related variables for a plurality of outputs of a manufacturing process; b) developing a model based on the data for detecting faulty outputs of the manufacturing process; c) identifying which of the manufacturing related variables have a substantial effect on the model for detecting faulty outputs of the manufacturing process; and d) updating the model by using the manufacturing related variables identified in step c) to improve the ability of the model to detect faulty outputs of the manufacturing process.