Use the summary of the design to examine the key design properties. Most properties of the design match selections that you made for the base design during design creation. The number of runs differs from the number of runs in the base design when the design includes any of these elements:
Replicates: Each replicate adds runs equal to the number of corner points and center points in the base design.
Center points: Each center point adds 1 to the number of runs in the base design.
Text factors and center points: Minitab adds center points at each level of a text factor in a 2-level design. Thus, each text factor doubles the number of center points in the design.