Document Type

Closed Project

Publication Date

Spring 2001


Dragan Milosevic

Course Title

Total Quality Management

Course Number

EMGT 560/660


Semiconductor industry -- Management, Production engineering, Process control -- Statistical methods, Semiconductors -- Measurement -- Data processing


This project is to explore the use of Statistical Process Control (SPC), in particular the Exponentially Weighted Moving Average (EWMA), to ensure continues improvement in a chemical process. Particular interest in this study is to see how well analytical machines would measure the wafer thickness. EWMA requires that all past information is gathered with more weight given to the most recent data. In conclusion, the data under study reveals that EWMA is an effective way in controlling and detecting whether or not the moving target operates within the process limit and thus, confirm the reliability of the measurements by the machines.


This project is only available to students, staff, and faculty of Portland State University

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