Case Study  

The Brewery which considered the Technical

Guarantees part of a Contract to be honoured

   ROC-curve of a Fill Level inspection.   Imagine to pass 1000 times a test container through one and the same Electronic Inspector equipped with a dual Fill Level Inspection: X-ray and High Frequency (or, Optic with camera).  Alternatively enabling detection of the first or second inspection system.  In the meantime, check one-by-one all rejects attributed to the Fill Level Inspection and add also these to the final two statistical distributions of the hits and misses (True Positives, False Positives, True Negative and False Negatives).  You’d discover the bold difference between these technologies in the marked spreading of the High Frequency or, Optic inspections' distributions.   More, if you’d repeat along one year on a monthly base the same identical test, you’d also see that, keeping constant the Fill Level sensitivity threshold parameter (never decreasing nor increasing it), the distribution could be more spread than that recorded 2-3 months before, implying False Rejects (False Positives).  False rejects that in the High Frequency- and Optic-Fill Level inspections are a superposition (or, sum) depending on more than a dozen variable factors, some of them also correlated, with their permutations running into the thousands...   To prevent the observed False Rejects, you are finally “compelled” to reduce the sensitivity of the High Frequency- or Optic-inspections.  What does not happen with the X-ray Fill level Inspection (  abridged by Jutta234/CC BY-SA 3.0/2006)

The ROC-curve (Receiver Operating Characteristic) above is strictly inherent to the Case study briefly examined below.  To the date we lived a long row of real cases implying the conflict between the necessity to sell of a Party, and the necessity of the other Party to use within the limits imposed by a Bottler Quality Control Policy and standards enforced by Law.  Between these, we also remember who, how, where and when on behalf of a truly great Brewery: 

  1. Signed a gigantic Contract, including many GRB Bottling Lines, buying by mean of an OEM also some eletronic inspectors equipped with the High Frequency Fill Level Inspection;
  2. let them be installed in the outfeed of what were in that moment the fastest existing GRB Filler Machines of the entire Planet;
  3. reality get out very soonillusory Technical Guarantees.  Exactly the same cliche’ yet bitterly felt by many other Bottlers in the World.   A situation requesting the Brewery to decide what, one way or another, was an auto-goal: 
    • downgrading its own Quality Control Policies and Standards under the Legal saleability levels, reducing the sensitivity threshold in the Inspectors so to let bottles underfilled 1.5 % pass undetected and unrejected;
    • or, to cut along following 15 years the entire beer Bottling Line Production efficiency with the micro-stops deriving by the fallen bottles and jams implicit in extremely high levels of false rejects, plus the Production losses implicit in the false rejects;
  4. imposed to the OEM (and the Inspectors’ Vendor) to respect the Contract.    In no Contract is written that “a Bottler shall have Quality or Production”, rather than that Quality and Production shall be simultaneously given.   Production including some specified losses (mechanical efficiency + false rejects);
  5. Vendor kept operative on-site nearly 6 months a Service Technician;  
  6. Several months after the telenovela started to be expensively staged, the Electronic Inspectors were ...thrown out.    The Brewery compelled the OEM to replace them with inspection equipments by a Vendor's Competitor;
  7. Competitor’s equipments were nothing better than the others, equipped with similar High Frequency fill level inspections.   But, with a full knowledge of what happened to the other Vendor, the Competitor cared to sign only goals they really could fulfill.   

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