ISO 28591:2017 属性による検査のための順次サンプリング計画 | ページ 6

3.1

inspection

conformity evaluation by observation and judgement accompanied as appropriate by measurement, testing or gauging

[SOURCE:ISO 3534‑2:2006, 4.1.2]

3.2

inspection by attributes

inspection (3.1) by noting the presence, or absence, of one or more particular characteristic(s) in each of the items in the group under consideration, and counting how many items do, or do not, possess the characteristic(s), or how many such events occur in the item, group or opportunity space

Note 1 to entry: When inspection is performed by simply noting whether the item is nonconforming or not, the inspection is termed inspection for nonconforming items. When inspection is performed by noting the number of nonconformities on each unit, the inspection is termed inspection for number of nonconformities.

[SOURCE:ISO 3534‑2:2006, 4.1.3]

3.3

item

entity

anything that can be described and considered separately

[SOURCE:ISO 3534‑2:2006, 1.2.11]

3.4

nonconformity

non-fulfilment of a requirement

[SOURCE:ISO 3534‑2:2006, 3.1.11]

Note 1 to entry: See notes to 3.5.

3.5

defect

non-fulfilment of a requirement related to an intended or specified use

Note 1 to entry: The distinction between the concepts defect and nonconformity (3.4) is important as it has legal connotations, particularly those associated with product liability issues. Consequently the term “defect” should be used with extreme caution.

Note 2 to entry: The intended use by the customer can be affected by the nature of information, such as operating or maintenance instructions, provided by the customer.

[SOURCE:ISO 3534‑2:2006, 3.1.12]

3.6

nonconforming item

item (3.3) with one or more nonconformities (3.4)

[SOURCE:ISO 3534‑2:2006, 1.2.12]

3.7

percent nonconforming

[SOURCE:ISO 2859‑1:1999, 3.1.8]

3.8

percent nonconforming

Note 1 to entry: Adapted from ISO 2859-1:1999, 3.1.9.

Note 2 to entry: In this International Standard, the terms percent nonconforming (3.7 and 3.8) or nonconformities per 100 items (3.9 and 3.10) are mainly used in place of the theoretical terms “proportion of nonconforming items” and “nonconformities per item” because the former terms are the most widely used.

3.9

nonconformities per 100 items

[SOURCE:ISO 2859‑1:1999, 3.1.10]

3.10

nonconformities per 100 items

Note 1 to entry: Adapted from ISO 2859-1:1999, 3.1.11.

Note 2 to entry: An item may contain one or more nonconformities.

3.11

lot

definite part of a population constituted under essentially the same conditions as the population with respect to the sampling purpose

Note 1 to entry: The sampling purpose can, for example, be to determine lot acceptability, or to estimate the mean value of a particular characteristic.

[SOURCE:ISO 3534‑2:2006, 1.2.4]

3.12

lot size

number of items (3.3) in a lot (3.11)

[SOURCE:ISO 2859‑1:1999, 3.1.14]

3.13

sample

subset of a population made up of one or more sampling units

[SOURCE:ISO 3534‑2:2006, 1.2.17]

3.14

sample size

number of sampling units in a sample (3.13)

[SOURCE:ISO 3534‑2:2006, 1.2.26]

3.15

acceptance sampling plan

plan which states the sample size(s) (3.14) to be used and the associated criteria for lot acceptance

[SOURCE:ISO 3534‑2:2006, 4.3.3]

3.16

consumer's risk quality

Q_cr

<acceptance sampling> quality level of a lot (3.11) or process which, in the acceptance sampling plan (3.15) , corresponds to a specified consumer's risk

[SOURCE:ISO 3534‑2:2006, 4.6.9]

Note 1 to entry: The specified consumer's risk is usually 10 %.

3.17

producer's risk quality

Q_PR

<acceptance sampling> quality level of a lot (3.11) or process which, in the acceptance sampling plan (3.15) , corresponds to a specified producer's risk

[SOURCE:ISO 3534‑2:2006, 4.6.10]

Note 1 to entry: The specified producer's risk is usually 5 %.

3.18

count

when inspection by attributes is performed, the result of the inspection of each sample item

Note 1 to entry: In the case of the inspection for nonconforming items, the count is set to 1 if the sample item is nonconforming. In the case of the inspection for nonconformities, the count is set to the number of nonconformities found in the sample item.

3.19

cumulative count

when a sequential sampling plan is used, the sum of the counts during inspection, counting from the start of the inspection of the lot up to, and including, the sample item last inspected

3.20

cumulative sample size

when a sequential sampling plan is used, the total number of sample items during inspection, counting from the start of the inspection of the lot up to, and including, the sample item last inspected

3.21

acceptance value

<for sequential sampling> value used in the graphical method for determination of acceptance of the lot, that is derived from the specified parameters of the sampling plan and the cumulative sample size

3.22

acceptance number

<for sequential sampling> number used in the numerical method for determination of acceptance of the lot, that is obtained by rounding the acceptance value down to the nearest integer

3.23

rejection value

<for sequential sampling> value used in the graphical method for determination of non-acceptance of the lot, that is derived from the specified parameters of the sampling plan and the cumulative sample size

3.24

rejection number

<for sequential sampling> number used in the numerical method for determination of non-acceptance of the lot, that is obtained by rounding the rejection value up to the nearest integer

3.25

acceptability table

table used for the lot acceptability determination in the numerical method

3.26

acceptability chart