Redundancy factors are determined by the program and then used to modify the load factors applied to the seismic load cases in the generated load combinations. It's important to note that the redundancy factors always calculated for every seismic load case, even if your model is in an area of low seismic activity. They only apply to US codes.

• Select Criteria > Redundancy Factors.
  
• For the Code choose IBC 2000/2003 (when code references are separated with a slash, it indicates that the two codes are identical).
• Set the other variable as indicated above and click [OK].