Grading System Recommendations

A number of reasons:

It is difficult to establish the validity and reliability of subjective evaluation.
To prevent grade inflation (among some instructors.....ones that tend to grade on the easy side) and potential evaluator bias.
Also, because in pre-licensure programs we are preparing them for NCLEX (an objective exam).

I don't recall if there was an actual resource cited for this, but it made sense to me.

I also use the 15% or less on subjective assignments and make a detailed rubric for all subjective assignments. It really seems to reduce student anxiety.