30 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE I: SINGLE SAMPLING LOT INSPECTION TABLES-BASED ON 



STATED VALUES OF "LOT TOLERANCE PER CENT DEFECTIVE" AND 



CONSUMER'S RISK = 0.10 



TABLE SL-O.S 

 Lot Tolerance Per Cent Defective = 0.5% 



Process 

 Average % 



Lot Size 



1-180 

 181-210 

 211-250 



251-300 

 301-400 

 401-500 



501-600 

 601-800 

 801-1000 



1001-2000 

 2001-3000 

 3001-4000 



4001-5000 

 5001-7000 

 7001-10,000 



10,001-20,000 

 20,001-50,000 

 50,001-100,000 



.006- .050 



.051-. 100 



All 

 180 

 210 



240 

 275 

 300 



320 

 350 

 365 



410 

 705 

 730 



1000 

 1020 

 1040 



1330 

 1600 

 1840 



AOQL 



% 



.02 

 .03 



.03 

 .04 

 .05 



.05 

 .06 

 .06 



.07 

 .09 

 .09 



.11 

 .12 

 .12 



.14 

 .15 

 .17 



.101-. 150 



.151-.200 



All 

 180 

 210 



240 

 275 

 300 



320 

 350 

 365 



670 

 955 

 1230 



1250 

 1510 

 1790 



2300 7 

 3060 10 

 378013 



AOQL 



.02 

 .03 



.03 

 .04 

 .05 



.05 

 .06 

 .06 



.08 

 .10 

 .11 



.12 

 .13 

 .14 



.17 

 .20 

 .22 



TABLE SL-1 

 Lot Tolerance Per Cent Defective = 1.0% 



Process 

 Average 9; 



Lot Size 



1-120 

 121-150 

 151-200 



201-300 

 301-400 

 401-500 



501-600 

 601-800 

 801-1000 



1001-2000 

 2001-3000 

 3001-4000 



4001-5000 

 5001-7000 

 7001-10,000 



10,001-20.000 

 20,001-50,000 

 50,001-100,000 



AOQL 



% 



.06 

 .08 



.10 

 .12 

 .13 



.13 



.14 

 .14 



.15 

 .15 



.15 



.16 

 .15 

 .16 



.21 

 .21 

 .21 



.011-. 10 



AOQL 



.06 

 .08 



.10 

 .12 

 .13 



.13 

 .14 

 .14 



.15 

 .20 

 .20 



.20 

 .21 



.25 



.26 

 .26 

 .29 



.11-. 20 



All 

 120 

 140 



165 

 175 

 180 



190 

 200 

 205 



360 

 505 

 510 



520 

 655 

 660 



785 

 920 

 1040 



AOQL 



% 



.06 

 .08 



.10 

 .12 

 .13 



.13 

 .14 

 .14 



.19 

 .23 

 .24 



.24 

 .27 

 .28 



.31 

 .34 

 .36 



.21-.30 



All 

 120 

 140 



165 

 175 

 180 



190 

 330 

 335 



490 

 630 

 645 



770 

 780 

 910 



1040 

 1300 

 1420 



AOQL 



% 



.06 

 .08 



.10 

 .12 

 .13 



.13 

 .15 



.17 



.21 



.24 

 .25 



.28 

 .29 

 .32 



.35 

 .39 

 .41 



n = Size of Sample; entry of "All" indicates that each piece in lot is to be inspected. 

 c = Allowable Defect Number for Sample. 

 AOQL = Average Outgoing Quality Limit. 



