Class A Surfacing

Step 1	Class A Verification
Position matching diagnostic to check position of patch edge. Class A requires the position to be within a tolerance of .005 millimeters.
Step 2	Tangency Deviation
Tangency deviation between two adjacent surfaces should be less than 0.15 degrees/minutes.
Step 3	Curvature Diagnostic
Continuous curvature is required between adjacent patches. This is best achieved by using the Curve Graph. The preferred graph is the "Bell Curve". Rate of acceleration or maximum curvature is reflected at the peak of the transition. The slope that leads into the peak and then back out are the edges of "lead in" to the minimum value of the radius.
Step 4	Shading Review
After technical concerns are respected, the part is shaded to specific lighting sources to reflect the overall appearance of the surface(s) generated.
Step 5	Reflection Diagnostics
Reflection diagnostics display the reflection qualities of the surface as to how all the patches relate to one another under specific light sources.