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Inspecting criteria needs

Discussion in 'ISO 9001:2015 - Quality Management Systems' started by Qualmx, Oct 28, 2018.

  1. Qualmx

    Qualmx Well-Known Member

    Oct 7, 2015
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    Hi all
    Could you recomend a criteria to follow when inspecting products?
    For example, how many parts to inspect based on quantities.
    What factor to consider when applying these methods.
    Thanks in advance
  2. Jennifer Kirley

    Jennifer Kirley Moderator Staff Member

    Jul 31, 2015
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    Good day Qualmx,

    Sampling is a big subject. One answer does not fit all needs. Primary considerations in setting up a plan include, in no particular order:
    1. Your customer's acceptance of the practice
    2. The cost of missed defectives
    3. The process should be in a state of control: that is, running consistently without the need for frequent intervention(s)
    4. Is the process running in batches/runs/lots, or continuous?
    5. If running in batches or lots, how many parts in each batch, run or lot?
    6. The amount of risk you are willing to accept; Acceptable Quality Limit (AQL) is established based on ramifications of missing defective parts
    There is a specification for sampling. In North America we still use ANSI/ASQ Z1.4. This link also shows links to other books. At this stage, I suggest Acceptance Sampling in Quality Control or the Certified Quality Engineer Handbook, though the Certified Quality Technician's Handbook is also good.

    Affiliation note: I am a member of ASQ.
    John C. Abnet, judegu and Qualmx like this.