Consumer electronic products have become an indispensable part of living for people with the development of information technologies. Crystal oscillator, CXO, a frequency controlling component, which is needed by communication-related industries, is widely used in expensive electronic products like mobile phones, notebook computers and GPS for its outstanding features of stability in temperature and low wearing. In CXO products, wires of ill quality are very likely to lead to ill contact between signal connectors and gold wires on IC or broken wires, which would cause the whole IC-packaged product unable to work normally. This article, thus, will develop a model of assessing and testing process capabilities with process capability index, Cpl, specifically for the larger-the-better quality characteristic of wire process. The article will also provide the assessment procedure, whereby the industry can effectively evaluate whether the process capabilities of their products meet the benchmarks they are supposed to.