How a sampling scheme calculates the sample size?

By : Chris 

Sample schema calculate the samples based on the inspection lot size. You need to maintain a Sampling plan tables under inspection severity.  e.g. Here an simple example is give for SAP STD inspection severity 004 - Normal inspection, sample plan. 

Lot Size Sample size :

1 1 
25 2
50 3
90 3
150 5
280 8
500 13
1200 20
3200 32
10000 50
35000 80
150000 125
500000 200
10000000000 315

Now assume the lot size is 230 so sample size = 5

The Other types of inspection severity are :

001 Inspection without sampling scheme
002 Reduced inspection
006 Tightened inspection

These are depend up on the parameters you selects in the Header Data for Schema.

Like Indicator: Attributive Inspection:- Means that the sampling scheme is used for an attributive inspection.  The sampling plan consists of the sample size, acceptance number, and rejection number.

Indicator: Variable Inspection According to S-Method: - Means that the sampling scheme is used for variable inspections.  The sampling instructions are related to the sample size and k factor.

Without Valuation Parameters: - Same as explained in the example above.

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