A BAS spec is typically a section within Division 23 (e.g., 230923), while the sequences and points are usually provided elsewhere (i.e., on the drawings, in section 230993, or some combination thereof). This column’s focus is on the 230923 specification, which includes requirements for the submittals, products, means and methods of installation, start-up and testing, training, warranty, etc. Which of these issues deserves your greatest attention, and how much detail is necessary?