Using Sampling Schemes in Sample Drawing Procedures

[Former Member]

Hi

I am wanting to use Sampling Schemes(SS) in the Sample Drawing Procedure(SDP) to be able to calculate the number of primary samples . When I fill in the SS that i want to use in the SDP it forces me to put in the Inspection Severity -which i dont understand why , as i thought it would get the Inspection Severity from the DMR .When i use this master data the IL creates the physical samples but always using the SS of the Inspection Severity that i was forced to maintain and never the one that is attached to the DMR .

Is it not possible to pull on the DMR when a SS is maintained in the SDP . I know it works this way when i maintain a SS in a Sampling Procedure

Any help would be greatly appreciated

[Former Member]

Hi Craig

Yes I am familiar with the DMR inspection severities and how they change within the DMR my question is around why , when using SS in SDP I need to maintain one of these Inspection Severties . Why doesn’t it change depending on the Quality level/ Inspection Severity that I am up to in the inspection lot .

I have 3 Inspection severties in my SS ( 001) Normal , (002) Reduced , and (003) Tightened . If in the SDP it forces me to maintain one then even though in my Inspection Lot I am at Tightened Inspection Severity it doesn’t read the Tightened SS to calculate the physical samples , it just uses the Inspection Severity that I have been forced to maintain in the SDP - effectively ignoring the Inspection Severity I am actually on in the Inspection Lot

I find this a bit strange and like I said it works fine when I use the SS in the Sampling Procedure ( ie it does look at the Inspection Severity from the Inspection Lot ) , so why doesn’t it allow the same functionality when using the SDP?

I hope this makes sense ?

[former_member42743]

Think of it this way. The sample drawing procedure has nothing to do with the number of samples required. (mostly).

It's mainly more about how the samples are built and allocated.

The sample procedures are calculated first. I.e. as a factor of the sample procedure, the inspection severity and if the severity is at a lot level of MIC level. This determines how many samples are required.

The sample drawing procedure is primarily determining HOW those samples are drawn across a particular shipment and if you need pooled samples and retained samples.

[former_member42743]

The sampling scheme is assigned to a sampling severity as the scheme usually changes with the severity.

So when you have a reduced severity, the number of samples taken is usually reduced. This is usually only achieved after having multiple successful inspections at the normal level.

When you have increased severity, the number of samples taken is usually increased. This happens after having failed inspections

Normal severity is used when you have no program for reduced testing.