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It Starts in the Parking Lot

10/21/2020

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     A person’s first interaction with a business is often his/her experience in its parking lot.  Unless an imposing edifice dominates the landscape, to be seen from afar, a person’s first impression of what it will be like to interface with a business is likely formed upon entering the parking lot.  It is during this introduction to the facility and company that many expectations are formed. “It” starts in the parking lot.  “It” is customer satisfaction.

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The War on Error – Vol. VIII:  Precontrol

10/7/2020

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     There is some disagreement among quality professionals whether or not precontrol is a form of statistical process control (SPC).  Like many tools prescribed by the Shainin System, precontrol’s statistical sophistication is disguised by its simplicity.  The attitude of many seems to be that if it isn’t difficult or complex, it must not be rigorous.
     Despite its simplicity, precontrol provides an effective means of process monitoring with several advantages (compared to control charting), including:
  • It is intended for use on the shop floor for rapid feedback and correction.
  • Process performance can be evaluated with far fewer production units.
  • No calculations are required to perform acceptance evaluations.
  • No charts are required.
  • It is not based on an assumption that data is normally distributed.
  • It is straightforward, based on specification limits.
  • It uses a simple, compact set of decision rules.
     This installment of “The War on Error” explains the use of precontrol – how process monitoring zones are established, the decision rules that guide responses to sample measurements, and the fundamental requirements of implementation.  Some potential modifications will also be introduced.

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