AASHTO GSFCM-1, Guide Specifications for Analysis and Identification of Fracture Critical Members and System Redundant Members, First Edition (2018), sets out a procedure for deciding whether a steel tension member is fracture critical or system redundant. Fracture critical members are steel primary members in tension whose failure would probably cause a portion of or the entire bridge to collapse. Section 2 provides screening criteria. Section 3 sets out a finite element analysis methodology, covering minimum failure scenarios, dead and live loads, dynamic amplification following sudden member failure, and load combinations. Section 4 gives material models for structural and reinforcing steel and for reinforced concrete in compression and tension. Meshing requirements for steel members and concrete slabs and the treatment of interactions and constraints complete the methodology. The guide is intended for bridge engineers and analysts evaluating existing steel bridges.