Quality quiz (July 2017)—and June’s quiz winners!

Winners of last month’s quiz and a copy of Practical Tools for Continuous Improvement: Volume 1 are Mike Nicholas (Schumacher Homes of Canton, OH); Alberto Garcia (Jackson Transformer Co of Tampa, FL); and Tina Abendroth (Midwest Blow Molding of Vandalia, IL). Congratulations! For this month’s quiz, and a chance to win a copy of Practical Tools for Continuous Improvement: Volume 1, submit your response by July 31.

Ms. Collette D’Bills, patient accounting, has gathered data related to accounts receivable, entering it to an Excel spreadsheet. In fact, she has several years’ worth of data in her Excel files, but has not been able to understand what it means, except to see that accounts receivable sometimes go up and sometimes go down. At the end of the year, she usually files the spreadsheets along with earlier records and gives them no further thought.

Her new assistant, Anne A. Lytical, is appalled at this waste. “Why, if you had charted this data, you’d be able to see trends,” she exclaimed. Collette points out that she has seen trends. “Sometimes receivables are up, sometimes they’re down.” That was enough of a trend to suit her.

Anne, however, charts the data, and within minutes she brings Collette the following chart.

At the seminar, Dr. Noah Tahl explains the meaning of “in-control” and “out-of-control,” and picks up Collette’s chart to examine it. “Your accounts receivable process is definitely out of control,” he says, as his finger follows the downward trend of the data. “You’ve got to get this process back under control!”

“But,” says Colette, “we’ve made so much improvement, how can it be a bad thing that the data is out of control?” She sends follow-up letters to all customers three weeks after they have been billed; if there is no response, Colette then makes an additional phone call. But true to his name, Dr. Noah Tahl insists that his job is to bring processes into control, and since hers is definitely not, it must be changed.

Who is right?

a. Dr. Noah Tahl
b. Ms. Collette D’Bills

2 thoughts on “Quality quiz (July 2017)—and June’s quiz winners!

  1. Collette is correct.

    In this situation being “out of statistical control” is actually a good thing, as performance has improved.

    Moving forward, the “old” data should no longer be included on the Control Chart as a new improved baseline has now been established.

    Dr. Tahl should go back to remedial Control Chart logic class…

  2. As per control charts, it is out of control.
    As improvements have been done, data need to be segregated before and after improvements to recalculate control limits based on data collected after improvements.

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