Committees responsible
National foreword
Specification
Section 1. General
1.1 Scope
1.2 Normative references
1.3 Definitions and symbols
1.4 Principle of sequential sampling by variables
Section 2. Choice of sampling plan
2.1 Factors determining the choice of a sequential
sampling plan by variables
2.2 Particular reservations on the inspection of small
lots
2.3 Selection of a sampling plan
2.4 Pre-operation preparations
Section 3. Operation of a sequential sampling plan
3.1 Specification of the plan
3.2 Preparing the sampling plan
3.3 Drawing of the sample
3.4 The cumulative leeway
3.5 Determination of acceptability
3.6 Operating characteristic curves and average sample
size
Annexes
A (normative) Sequential sampling plans corresponding
to ISO 3951 single sampling plans
B (normative) Determination of the parameters of a
sequential sampling plan
C (normative) Calculation of operating characteristic
curve and average sample size
D (informative) Bibliography
Tables
1 Sequential sampling plans by variables for percent
nonconforming for producer's risk alpha = 0,05 and
consumer's risk beta = 0,10
2 Values of psi for limiting process standard
deviation LPSD (combined double specification
limits)
3 Values of f for maximum process standard deviation
MPSD (separate double specification limits)
A.1 Sequential sampling plans corresponding to ISO
3951 single sampling plans for normal, tightened
and reduced inspection (master table)
A.2 Curtailment values for the sequential sampling
plans of table A.1
A.3 Values of psi for limiting process standard
deviation, LPSD (combined double specification
limits), for the sequential sampling plans of table
A.1
A.4 Values of f for maximum process standard deviation,
MPSD (separate double specification limits), for
the sequential sampling plans of table A.1
A.5 Average sample size for the sequential sampling
plans of table A.1
Figures
1 Operating characteristic curve for a sampling plan
with producer's risk alpha = 0,05 and consumer's
risk beta = 0,10
2 Inspection record sheet for the sequential sampling
plan for a single specification limit considered in
the example given in 3.2.1.3
3 Acceptance chart for the sequential sampling plan
for a single specification limit considered in the
example given in 3.2.1.3
4 Inspection record sheet for the sequential sampling
plan for combined double specification limits
considered in the example given in 3.2.2.3
5 Acceptance chart for the sequential sampling plan
for combined double specification limits considered
in the example given in 3.2.2.3
6 Inspection record sheet for the sequential sampling
plan for separate double specification limits
considered in the example given in 3.2.3.3
7 Acceptance chart for the sequential sampling plan
for separate double specification limits considered
in the example given in 3.2.3.3
8 Acceptance chart for the sequential sampling plan
for a single specification limit considered in the
example given in 3.5.1.3
9 Acceptance chart for the sequential sampling plan
for combined double specification limits considered
in the example given in 3.5.2.3
10 Acceptance chart for the sequential sampling plan
for separate double specification limits considered
in the example given in 3.5.3.3
C.1 Operating characteristic curve for the sequential
sampling plan considered in the example given in
C.2.3
C.2 Curve showing the average sample size for the
sequential sampling plan considered in the example
given in C.3.3