When to Inspect!

K. Tang and J. Tang (1994, Design of screening procedures: a review. Journal of Quality Technology 26(3) p. 209-226.) list some useful rules about when to inspect during manufacturing.

1. Inspect after procedures likely to produce nonconforming items.
Rasch: After applying a scoring key, check for misfit and negative point-biserial correlations.

2. Inspect before costly procedures.
Rasch: Inspect before analyzing an enormous sample. Inspect output on screen before printing on paper.

3. Inspect before procedures where nonconforming items may jam machines.
Rasch: Misinterpretation of incorrect results "jams" the mind, vitiating analysis of correct results.

4. Inspect before procedures that cover up nonconforming items.
Rasch: Scan maps and numerical details before counting on summary statistics.

5. Inspect before assembly procedures where rework is costly.
Rasch: Inspect before using Rasch measures for statistical analysis or substantive decisions. Errant pass-fail decisions are hard to reverse.

When to inspect. Tang K, Tang J. … Rasch Measurement Transactions, 1996, 10:1 p.483

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Rating Scale Analysis, Wright & Masters	Introduction to Rasch Measurement, E. Smith & R. Smith	Introduction to Many-Facet Rasch Measurement, Thomas Eckes	Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr.	Statistical Analyses for Language Testers, Rita Green
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