The Technology Assessment Directorate was an organization within Starfleet which made decisions regarding the technological requirements of certain Starfleet projects, including starbase construction, then requested bids of independent civilian contractors and issued contracts. They generated a lengthy and complex report regarding the plans to build Starbase Deep Space 10 sometime prior to 2376. (CoE eBook: Troubleshooting)

The TAD classify Deep Space 9 as a "Hybrid Planar-Columnar Triradial structure". (DS9 reference: Star Trek: Deep Space Nine Technical Manual)

Divisions and agencies of Starfleet
	Academy • Administration • Advanced Starship Design Bureau • Advanced Technologies • ALLANGTRANS • Appeals Board • Astronomics • Bureau of Information • Bureau of Standards • Casualty Notification • Command • COMMSATTRAC • Communications • Control • Corps of Engineers • Criminal Investigative Service • Cultural Affairs • Cultural Analysis • Cultural Survey Bureau • Dental • Diplomatic protection group • Exploratory Division • GALVEGRE • Headquarters • Humanoid Resource Records • Humanoid Resources • Information • Inspector General • Intelligence • Internal Affairs • Judge Advocate General • Marine Corps • Materiel Supply Command • Medical • Medical Forensics • Merchant Marine • Mission Operations • Navigational Research • Operations • OSHC • Orbital Operations • Propulsion Technologies • Psychological • Records • Research and Development • Regulatory • Science • Science Operations • Sector Guard • Security • Shipyards Operations • Special Security Division • Special Services • Stellar Imaging • Strategic Command • Tactical • Technical Intelligence • Technology Assessment Directorate • TechSupDiv • Temporal Integrity • Training Command