I find it kind of a throw back to the days when the manly sciences were privileged over other disciplines. I don't think qualitative scores tell much about literacy growth. Nor do I think they are particularly accurate. Miscue analysis is an assessment tool designed by Yetta Goodman. It seems to me that the running record used by the guided reading people is similar.
Miscue analysis gives teachers an excellent view into the reading processes of an individual reader.
I would guess an internet search of miscue analysis, miscue analysis inventory, or Yetta Goodman would provide you with a wealth of information. I would assume any literacy task in a classroom would be designed to improve a student's literacy, so task completion, or even an attempt should help grow literacy. Since reading comprehension is largely based on a student's prior knowledge, and since none of these formulas can take into consideration the social aspect of meaning construction, these formulas are basically worthless. Nancy G. Patterson Portland Middle School, English Dept.