Excellent article: William Farish: The World's Most Famous Lazy Teacher
- Grades did not make students smarter. In fact, they had the opposite effect: they made it harder for those children to succeed whose style of learning didn't match the didactic, auditory form of lecture-teaching Farish used.
- Grades didn't give students deeper insights into their topics of study. Instead, grades forced children to memorize by rote only those details necessary to pass the tests, without regard to true comprehension of the subject matter.
- Grades didn't encourage critical thinking or insight skills, didn't promote questioning minds. Such behaviors are useless in the graded classroom, and within a few generations were considered so irrelevant that today they're no longer listed among the goals of public education.
- Grades didn't stimulate the students, or share with them a contagious love for the subject being studied. The opposite happened, in fact, as the normative effect of grades acted as a muffling blanket to any eruptions of enthusiasm, any attempts to dig deeper into a topic, any discursions into larger significance or practical application of content.
via adlit.org
This article is quite good. Make sure you read the whole thing, not just the little quote I pulled out.

