Quality Function Deployment and Six Sigma, Second Edition: A QFD Handbook (2nd Edition) by Joseph P. Ficalora & Louis Cohen

Author:Joseph P. Ficalora & Louis Cohen [Ficalora, Joseph P.]
Language: eng
Format: epub
Publisher: Pearson Education
Published: 2009-07-15T04:00:00+00:00

A similar but slightly more complex relationship can be modeled in the case of Target Best (TB). Here we might consider that a parabola best describes the relationship between technical performance and Customer Satisfaction Performance, as in Figure 12-3, where the target value for p is 4. (The meaning of the other variables is as before.)

Figure 12-3 Customer Satisfaction Performance s(p) vs. Technical Performance (p), Target Is Best

The coordinates of the first point are (pworld class, sworld class)—that is, the point that corresponds to the ideal target value. Since the direction of goodness is Target Is Best, it is not possible to perform better than the target (4). In this example, we have assumed that achieving the target (4) results in the best possible Customer Satisfaction Performance (5).

The coordinates of the second point are (s0, p0)—that is, the point that corresponds to the development team’s current product. As in the previous example, Customer Satisfaction Performance was determined by market research, and the value of the SQC (4) was determined by laboratory measurement.

The general equation for the parabola in Figure 12-3 is

sTB(p) = [|sworld class − s0| × (p − target value)2] ÷ (− p02 + 2 × p0 × target value − target value2) + sworld class

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