Quantcast Planned Sampling -Cont.

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MO-327 CHG 94-01
(b) Primary Method of Surveillance. The primary method of
surveillance is planned sampling.  Validated customer complaints
are a good supportive surveillance method.
The Maximum Allowable Defect Rate (MADR) is
(c) MADR.
specified in the PRS, the MADR is the defect rate in the
population above which the contractor's quality control is
considered  unsatisfactory.  MADR may be stated as percentage or
as an absolute value (e.g., 3 per surveillance period).
Define a single
Identification of the POpulation.
occurrence of work and determine t he number of occurrences to be
performed during the surveillance period (usually one month) as
If the work is being carried out as several
shown at 4-510.
locations,  the work locations are numbered sequentially in the
order corresponding  to the most efficient route the QAE would
(See 4-520,
follow if al l the l ocations were inspected.
Sequential Numbering of Work locations.)
Consider the
Sequential Numbering of the POpulation.
desirability of sequentially numbering t h e services in accordance
with 4-600.
Two or three levels of
(f) Level of Surveillance.
surveillance may be defined.
Determination of the Sample Size.  Determination  of
sample size for planned sampling is subjective and the sample
In order to provide consistent
size is arbitrarily determined.
surveillance and provide a basis comparing trends from month to
month, consistent criteria should be used in selecting the sample
(h) Selection of the Sample from the Population.
criteria for sample selection must be documented and applied
consistently from surveillance period to surveillance period. If
there is no consistency, trends in contractor performance cannot
be detected.
(i) Evaluation Procedure. List any procedures or
Evaluation  procedures
checklists used when doing  inspection.
should be in enough detai l to allow others to continue the same
manner of inspection using the same evaluation criteria.
Evaluation procedures should include provisions for recording the
successful accomplishment of rework by the contractor.
(j) Analysis of Results. The defect rate (DR), when
planne d sampling is used, is calculated by dividing the total
number of ob served defects (including those detected by validated
customer  complaints and incidental inspections) by the total
population of services so that
DR = Total Number of Observed Defects X 100
Total Population
Dividing the number of defects in the sample b  the sample size
gives a defect rate for the sample only, and t h e use of this
"Observed Defect Rate"  (ODR) to either assess the contractor's
performance or take deductions to


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