Taguchi methods are methods of product quality improvement that analyze major contributions and how they can be controlled to reduce variability of poor performance. In this approach, knowledge is used to shorten testing. Taguchi methods are concerned with process improvement rather than with process measurement. This manual is designed to be used as an instructional aid in a workshop or course on Taguchi methods. It contains the following six sections: intuitive approach to the key issues of process control; introduction to the loss function; introduction to experimentation; introduction to orthogonal arrays; introduction to interactions; and a case study. An appendix contains orthogonal arrays and linear graphs and derivation of the loss function. Transparencies are provided for all key elements of the discussion, with space for participants to fill in the blanks. (KC)