This international standard is intended to define a procedure to verify if a reliability of an 
item/system complies with the stated requirements. The requirement is assumed to be specified 
as the percentage of success (success ratio) or the percentage of failures (failure ratio).  
This document can be used where a number of items are tested (number of trials performed) 
and classified as passed or failed. It can also be used where one or a number of items are 
tested repeatedly. The procedures are based on the assumption that the probability of success 
or failure is the same from trial to trial (statistically independent events). Plans for fixed 
trial/failure terminated tests as well as truncated sequential probability ratio tests (SPRTs) are 
included. This document contains extensive tables with ready-to-use SPRT plans and their 
characteristics for equal and non-equal risks for supplier and customer. 
In the case of the reliability compliance tests for constant failure rate/intensity, IEC 61124 
applies.dition 2.0 2019-11 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Reliability testing – Compliance test plans for success ratio Essais de fiabilité – Plans d'essai de conformité pour une proportion de succès IEC 61123:2019-11(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2019 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publicat