C. S. I .. Construction Specification Institute over 100 years old owned by Magrall Hill Publishing

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CSI (Construction Specifications Institute) organizes construction work information using MasterFormat, which is commonly known as the “50 Divisions” structure (division numbers + titles). Here are the 50 divisions (2018 edition) categories:

• Division 00 — Procurement and Contracting Requirements
• Division 01 — General Requirements
• Division 02 — Existing Conditions
• Division 03 — Concrete
• Division 04 — Masonry
• Division 05 — Metals
• Division 06 — Wood, Plastics, and Composites
• Division 07 — Thermal and Moisture Protection
• Division 08 — Openings
• Division 09 — Finishes
• Division 10 — Specialties
• Division 11 — Equipment
• Division 12 — Furnishings
• Division 13 — Special Construction
• Division 14 — Conveying Equipment
• Division 15 — Plumbing + HVAC
• Division 16 — Electrical + Lighting
• Division 17 — Reserved for Future Expansion
• Division 18 — Reserved for Future Expansion
• Division 19 — Reserved for Future Expansion
• Division 20 — Mechanical Support
• Division 21 — Fire Suppression
• Division 22 — Plumbing
• Division 23 — Heating Ventilating and Air Conditioning
• Division 24 — Reserved for Future Expansion
• Division 25 — Integrated Automation
• Division 26 — Electrical
• Division 27 — Communications
• Division 28 — Electronic Safety and Security
• Division 29 — Reserved for Future Expansion
• Division 30 — Reserved for Future Expansion
• Division 31 — Earthwork
• Division 32 — Exterior Improvements
• Division 33 — Utilities
• Division 34 — Transportation
• Division 35 — Waterways and Marine Construction
• Division 36 — Reserved for Future Expansion