What is the major criterion in determining whether unclassified correspondence is serialized or not?

The major criterion in determining whether unclassified correspondence is serialized or not is based on volume. When the volume of correspondence is substantial, it often necessitates a serialized approach to ensure proper tracking, organization, and management of the documents. This is particularly important to maintain a clear record of correspondence flowing through the unit, especially when numerous documents may need to be referenced or recalled later.

A high volume indicates that there are many pieces of correspondence being generated or sent, which can lead to confusion if not managed properly. Serialization allows for easier identification, reference, and retrieval of documents, ensuring important information is not lost or overlooked amid a large number of communications.

In contrast, length, recipient, and content are aspects that may influence how correspondence is structured or addressed but are not the primary factors for serialization. Length could relate to how detailed a correspondence may need to be, recipient primarily concerns who the correspondence is directed to, and content deals with the subject matter at hand. However, none of these criteria dictate the need for serialization in the same way that volume does.