Ladies,
You gave me a smile today!

I agree that grading is fairly subjective for most subjects, so we use the portfolio approach for most of the work within our guides instead. Subjects such as grammar and math are easier to grade, if desired. Even then, we would typically recommend grading only at the chapter reviews and only on the second review of Singapore (using the first review as practice).

Until high school, most states have the option of either keeping grades or keeping a portfolio to record academic progress.
Blessings,
Carrie