You should mention that in your article then, keeping in mind that the progression from F to A in most grading systems is linear and that some of us may not see

You should mention that in your article then, keeping in mind that the progression from F to A in most grading systems is linear and that some of us may not see the differences between calibers of engineers in the same way. That said I'm grasping for the grade analogy, as grades are highly dependent on the subject matter and other factors that I'd consider external, and represent a rigid point-in-time assessment.