What is the primary purpose of the Sample Selection Matrix?

The primary purpose of the Sample Selection Matrix is to provide a comprehensive report of containers to select. This matrix serves as a tool that helps mailers efficiently organize and identify which specific containers of mail should be chosen for distribution or further processing. By utilizing the matrix, mailers can streamline their operations and ensure that they are selecting the appropriate items based on defined criteria, which aids in maintaining accuracy and efficiency in the mailing process.

Other aspects such as identifying mailers, calculating shipping costs, or scheduling mail pickups are tasks that might be part of broader mailing operations, but they do not represent the core function of the Sample Selection Matrix itself, which is specifically focused on organizing and reporting the selection of containers.