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William A. Levinson’s picture

By: William A. Levinson

Inspection is a mandatory but nonvalue-adding activity, and our objective is to do as little as possible, provided that we continue to fulfill the customer’s requirements. The zero acceptance number (c = 0) sampling plan requires far less inspection than the corresponding ANSI/ASQ Z1.4 (formerly MIL-STD 105) plan, and becomes viable when the supplier is extremely confident in its level of quality.1

An ANSI/ASQ Z1.4 plan consists of a sample size n, and an acceptance number c. The inspector checks n items, and accepts the lot if c or fewer defects or nonconformances are found. These plans are designed to give (roughly) a 95-percent chance of acceptance at the acceptable quality level (AQL), which is one of the parameters for the plan’s selection.

The c = 0 plan, on the other hand, rejects the lot if any defects or nonconformances are found, but it requires a considerably smaller sample size. The drawback is that the producer’s risk (α) of rejecting a lot at the AQL is usually far greater than the textbook 5 percent, so the c = 0 plan should be used only when quality is much better than the AQL. This reinforces a basic principle of industrial statistics: We can have low risks or small sample sizes, but we can’t have...

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By: Quality Digest

Audits have long been viewed as a necessary evil, but did you know they can add tremendous value to your organization? Sign up now to access this curated collection and find out how.

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By: Quality Digest

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Annelise Orleck’s picture

By: Annelise Orleck

Pico Rivera is a dusty working-class Latino suburb of Los Angeles. After the school district, Walmart is the city’s largest employer and the source of 10 percent of its tax revenue. More than 500 families in the town depend on income from the store. The town is also the epicenter of activism by Walmart workers in the United States. Walmart associates have been fighting for four years to pressure the world’s largest private employer to grant its workers decent conditions, a living wage, and regular hours.

Last fall, I flew to Los Angeles to interview Pico Walmart workers for a book I’m writing about the 21st-century struggle by workers worldwide for a living wage. The Pico workers helped to galvanize that movement by organizing the first strike against a U.S. Walmart in 2012. Since that time, the world has seen expansive organizing by garment workers, farm workers, fast food workers, and retail workers from Cape Town to Canada, Bangladesh to Brazil, and Cambodia to California.

What Is ISO 9001:2015?- Guide Test Two

Almost 70 percent of American mothers with children younger than 18 work for pay, but motherhood remains disruptive for many women’s work lives.

American women earn almost 20 percent less per hour than their male peers, in part because women disproportionately take responsibility for raising children. Mothers often experience employment interruptions or reductions in work hours.

When it comes to understanding mothers’ long-term employment patterns, researchers know less. How common is it for mothers to persist working full-time throughout their child-rearing years? Which mothers are most likely to be absent from the labor market over the long term? What do employment patterns look like for mothers who fall in between these two extremes?

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