Described as an indispensable and one of the more important Services under the Senate Secretariat, the various functions and multifarious roles of the different units under the Bills and Index are inextricably entwined in every aspect of the Legislative process – from the filing of bills, the calendaring and preparation of the legislative agenda, the encoding of filed bills and resolutions into its proper format prior to First Reading, the referral of bills to its appropriate committees, the distribution of copies to individual Senators and other concerned Senate officers, the indexing of and monitoring of every bill filed, the engrossment of amendments of bills and resolutions down to the preparation of Third Reading copies and enrolled bills for signature – form part of its invaluable contribution to the constitutional mandate that legislative power be effectively exercised by both Houses of Congress.

Legislative Journal Service prepares and distributes the daily Journal and maintains the Record of Attendance of the Senators in the plenary session. It also prepares the highlights of the daily session and the Index of the Journal of the Senate.

Legislative Debate Reporters Service generates raw transcript of session proceedings and does the initial correction/editing of these transcripts upon referral to Senators for correction. It also prepares records/transcripts in the canvassing of votes during the election for President and Vice President.

Legislative Bill Drafting Service renders assistance to the members of the Senate in the drafting of bills and resolutions. It provides technical assistance to any Senate permanent committee in the preparation of proposed amendments, substitute or consolidated bills.

Legislative Parliamentary Counseling Service provides counseling service to members of the Senate and Secretariat officials in the form of opinions, advice and studies on parliamentary procedures, practices and precedents. It also provides technical assistance to the Senate on matters dealing with the interpretation and application of the Rules of the Senate and the formulation of proposed amendments to the same, when so requested.

Legislative Research Service conducts researches and studies on major legislation, policy issues and other specific legislative concerns of the Senate. This service prepares opinions, analyses, briefing papers and other forms of technical research assistance in response to queries or requests from the Senators, their staff and other offices of the Secretariat.

Legislative Publication Service handles the editing and publication as well as pre-press preparation, printing supervision, and quality control and distribution of the Record of the Senate and the Journal of the Senate (in coordination with the Legislative Journal Service). It designs, formats and handles production and distribution of publications documenting aspects of plenary proceedings that are authorized by the Senate President on the Senate Secretary.

Legislative Printing and Reproduction Service handles the design and production of forms, manuals, certificates, circulars, guidelines, orders, invitations, programs, posters, special resolutions and other documents intended for both internal and external or general circulation.

Legislative Records and Archives Service is the repository of all legislative records of the Senate. It is mandated to organize, preserve, maintain, secure and make available for reference and research the legislative records and historical records of the Senate.

Legislative Library Service is responsible for the selection, acquisition and compilation of reference materials relevant to legislation. It organizes and maintains various library collections and service facilities to strengthen information and reference services in the Senate. It provides reference and research assistance to the Senators and their staff, other legislative researchers, Secretariat officials and employees of the Senate.