SBS - The best value in QMS software

Determining the appropriate Sample Size using an AQL Table

theva

Involved In Discussions
#1
Hi,

Greetings, my company just being audited by our customer and 1 finding was captured on the AQL sampling size...the comment comes as below:-

sample size - 80
AQL 0.4 LII
Acc - 1, Rej - 0

There is arrow up and down within the box, the customer comment that we should switch the sampling size to 125 and also the acceptance criteria.

My doubt is..do we need to change the sampling size as well....
 
Elsmar Forum Sponsor
P

pearsonow

#2
Re: Determining the apropriate Sample Size using an AQL Table

As far as I recall you allow alter the acc/rej levels not the sample size, I don't have the std in front of me to check. I would suggest you read the text just before the tables, I believe it is quite clearly explained there.

Olly
 

Jim Wynne

Staff member
Admin
#3
Re: Determining the apropriate Sample Size using an AQL Table

Hi,

Greetings, my company just being audited by our customer and 1 finding was captured on the AQL sampling size...the comment comes as below:-

sample size - 80
AQL 0.4 LII
Acc - 1, Rej - 0

There is arrow up and down within the box, the customer comment that we should switch the sampling size to 125 and also the acceptance criteria.

My doubt is..do we need to change the sampling size as well....
See the attached page from MIL-STD-105E. I don't know what sampling plan you're using, or what your lot size is, but yours is a common question.

When there's an arrow in the table that points up or down, you are supposed to use the first sampling plan (see the bottom of the page) above or below the arrow. In your case, you can see that when using sample code letter "J" the sample size says 80 (hard to read in the copy), but when you follow it across the table to the 0.40 AQL column, there is an arrow pointing down to the next sampling plan, where the sample size is 125 and it's accept 1/reject 2.

So to answer your question, your customer is correct in telling you that the sample size should be increased.
 

Attachments

theva

Involved In Discussions
#4
Dear Jim,

Thanks for the explanation,

When there's an arrow in the table that points up or down, you are supposed to use the first sampling plan (see the bottom of the page) above or below the arrow. In your case, you can see that when using sample code letter "J" the sample size says 80 (hard to read in the copy), but when you follow it across the table to the 0.40 AQL column, there is an arrow pointing down to the next sampling plan, where the sample size is 125 and it's accept 1/reject 2.

I still need some explanation based on above statement, is there any source which I can link to or else:rolleyes:
 
P

pearsonow

#5
The standard. Which Sampling Standard are you using? this will help considerably.

It is fairly simple, if there is an arrow, follow the plan it is pointing to, including the sample size.

Olly
 

Jim Wynne

Staff member
Admin
#6
Dear Jim,

Thanks for the explanation,

When there's an arrow in the table that points up or down, you are supposed to use the first sampling plan (see the bottom of the page) above or below the arrow. In your case, you can see that when using sample code letter "J" the sample size says 80 (hard to read in the copy), but when you follow it across the table to the 0.40 AQL column, there is an arrow pointing down to the next sampling plan, where the sample size is 125 and it's accept 1/reject 2.

I still need some explanation based on above statement, is there any source which I can link to or else:rolleyes:
What sampling plan are you using? What explanation do you need?
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#7
the explanation is in either Mil-Std 105 or ANSI Z1.4 The instructions Jim quotes are in both standards.
 

Statistical Steven

Statistician
Staff member
Super Moderator
#8
Based on 105E you would need to sample 125 with a acc/rej of 1/2. Some customers might not accept a acc/rej of 1/2 so you would use a 0/1 plan regardless of the standard. Below are the vital statistics associated with the different options.

AQL 0.2% 0.064% 0.285%
LTPD 6.9% 2.829% 3.074%
Acc 0 0 1
n 32 80 125

Which plan would you use? I would use n=80 with 0/1 acc/rej
 

theva

Involved In Discussions
#10
We're using AQL 0.4 LII C=0.
The sample size is remain the same, the only changes is on the accpatance criteria, C=0. In this case, do we need to change the sampling size from J=80 to K=125, if the arrow shows up or down?
 
Thread starter Similar threads Forum Replies Date
Q Determining the Appropriate Sample Size for Process Validation/Qualification Inspection, Prints (Drawings), Testing, Sampling and Related Topics 13
J Determining the Appropriate Sampling Regime when Assigning Values to an IVD Device Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
Z Determining the Appropriate Measuring Device with respect to Accuracy - Poster? General Measurement Device and Calibration Topics 16
S Determining the requirements for the products and services ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
Q Determining Adverse Effects of Corrective/Preventive Actions ISO 13485:2016 - Medical Device Quality Management Systems 2
S Determining sample sizes for PQ Qualification and Validation (including 21 CFR Part 11) 4
M Determining if an Insulin Pen Testing Machine is a Medical Device? EU Medical Device Regulations 4
M Determining a tolerance value for Measuring devices in-house inspection General Measurement Device and Calibration Topics 12
D Determining the the maximum number of reprocessing cycles of attachments CE Marking (Conformité Européene) / CB Scheme 2
R Determining Uncertainty from Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
A IATF 16949 4.3.1 - Determining the scope of the quality management system - supplemental IATF 16949 - Automotive Quality Systems Standard 9
D ISO 9001:2015 4.3 Determining the Scope of the QMS ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
J Determining SPC tolerance Statistical Analysis Tools, Techniques and SPC 21
B Determining SAT Offsets vs TUS Offsets per SAE AMS 2750E AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 0
B Determining sample size for device sterility Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
D Determining of sample size for 'Operational Qualification' AQL - Acceptable Quality Level 5
R Question on determining defective units - I am not recording fixture to part rejected Statistical Analysis Tools, Techniques and SPC 5
S Clause 8.2.2 Determining the requirements for products and services ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 5
D Determining Calibration Frequency schedule for items used in production Manufacturing and Related Processes 2
C Determining if Maintenance Contractor is an External Service subject to ISO 9001 Clause 8.4 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 43
S AS9100D PEAR - Examples for organization's method for determining process results? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
I Determining Calibration Tolerance of a Measurement Device General Measurement Device and Calibration Topics 2
J ISO 17025 Documented Procedure for 6.2.5 - Determining competency ISO 17025 related Discussions 4
V Determining FDA 820 (registration) vs ISO 13485 - Supplier gives us the kit ISO 13485:2016 - Medical Device Quality Management Systems 1
J ISO 9001 8.4.1 - Determining controls applied to externally provided processes ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
E Determining what is good and what is bad can be subjective - when is it a quality issue? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
F Determining what type of scrap to include in my internal PPM calculation Quality Manager and Management Related Issues 5
M Determining number of employees within the "Scope" of the QMS ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
A Determining the Scope of the QMS during Stage 1? Registrars and Notified Bodies 11
W Minor Audit Nonconformance Against Determining the scope of QMS IATF 16949 - Automotive Quality Systems Standard 12
D Determining Critical Components for conformity with IEC 60601-1 IEC 60601 - Medical Electrical Equipment Safety Standards Series 21
Q ISO 9001, section 4.3 Determining the scope of our QMS ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
R Determining Sample Size for Medical Device Component Validation Inspection, Prints (Drawings), Testing, Sampling and Related Topics 0
A What does 8.2.2.1, Determining the requirements related to products and services,mean IATF 16949 - Automotive Quality Systems Standard 1
A Determining Retention Period for Medical Device QMS documents Document Control Systems, Procedures, Forms and Templates 5
S Surveillance Sampling Test - Determining Sample Size Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
F ISO 9001:2015 4.3 - Determining the scope of the quality management system ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 7
B Standards Needed In House - Determining what standards are applicable Various Other Specifications, Standards, and related Requirements 3
W Determining Medical Device Classification in Mexico Other Medical Device Regulations World-Wide 5
K Determining Effect of Failure without a DFMEA (Design FMEA) FMEA and Control Plans 1
W Determining the Status and Importance of the Processes and Areas to be Audited Internal Auditing 7
T Determining Customer Requirements for the US Postal Service (USPS) IATF 16949 - Automotive Quality Systems Standard 4
Crimpshrine13 Rules of achieving and maintaining IATF recognition - Determining audit days IATF 16949 - Automotive Quality Systems Standard 2
R Developing procedure for Determining Company's Context And Interested Parties ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 53
W Determining Asset Life or Depreciation Life for M&TE General Measurement Device and Calibration Topics 1
N Reason for determining no adverse effect on reworked product ISO 13485:2016 - Medical Device Quality Management Systems 8
N Procedure for determining pinhole position in condom Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
alonFAI Determining PCBA Xray Test Sampling Size Statistical Analysis Tools, Techniques and SPC 1
S Determining sample size for inspection to achieve x% confidence re defects Misc. Quality Assurance and Business Systems Related Topics 10
S Determining Sample Size - AQL & LQ AQL - Acceptable Quality Level 10

Similar threads

Top Bottom