Author: Alyssa Sloan

INTRODUCTION
Choosing the best sampling plan for process validation and design verification testing is aided by knowledge of all of the options. An alternative and often more efficient option to the single attributes sampling plan is the double sampling plan for attributes testing. The process leading to choosing a plan requires the same risk determination steps as the single sampling plan. These plans adhere to the Quality System Regulations (QSR) requirements, specifically those in Subparts C, G, and O of 21 CFR 820. The following is a discussion of the double sampling plan, how it works, and the benefits of using one.