ASTM F3263-17 "Standard Guidelines for the Validation of Encasement Test Methods" is designed to ensure the Reliability and Validity of Encasement test methods. The standard provides procedures for validating test methods and covers requirements for interlaboratory studies (ILS) and intraorganizational validation. Interlaboratory studies are primarily used to collect accuracy data, while intraorganizational validation involves detailed planning, execution, and analysis to ensure the accuracy of test methods. The guide also includes steps for writing accuracy and deviation claims, performing Attribute Test Method Validation (ATMV), and provides specific recommendations on how to handle different types of test methods and samples. The ultimate goal of this standard is to improve the Reliability and conformity of test methods, thereby ensuring the accuracy of test results.