Skew mesh quality
criterion reflects the angle between the lines that join opposite sides
of the element. SKEW is
a maximum value of all skew angles. This
mesh quality criterion can be applied to elements composed of 4 and 3
nodes (quadrangles and triangles)
To apply the Skew quality criterion to your mesh:
1. Display your mesh in the viewer.
2. Choose Controls
> Skew or click 
button of the toolbar. Your mesh
will be displayed in the viewer with its elements colored according to
the applied mesh quality control criterion:
See Also a sample TUI Script of a Skew quality control operation.