This directory serves as a comprehensive reference for the 106th United States Congress, providing essential information on its members and committees during the 1999-2000 legislative period. It details the structure and personnel of the U.S. government's legislative branch, offering a snapshot of its composition and leadership at a specific point in time. The publication aims to be an authoritative resource for understanding the workings of Congress.

As an official publication, the Congressional Directory is regarded as a primary source for information on the U.S. Congress. Its value lies in its direct compilation of data from congressional offices, making it an indispensable tool for researchers, historians, and anyone needing precise details on congressional membership and structure during the specified period. The directory's authority stems from its official status and its role in documenting legislative proceedings and personnel.