This International Standard specifies sequential sampling plans and procedures for inspection by variables of discrete items.The plans are indexed in terms of producer's risk point and the consumer's risk point. Therefore, they are suitable not only for the purposes of acceptance sampling, but for the more general purpose of the testing of simple statistical hypotheses for proportions.The purpose of this International Standard is to provide procedures for the sequential assessment ofinspection results that may be used to induce the supplier, through the economic and psychological pressure of non-acceptance of lots of inferior quality, to supply lots of a qu