How should teachers and high schools ration recommendations?

OH, I don’t mean a brag sheet of sorts.

What was suggested on the other thread was an article, or series of articles, on how to write a good letter of recommendation, not specifics on what the kid had accomplished.

Here’s the link: http://talk.qa.collegeconfidential.com/college-admissions/2078059-giving-advice-to-teachers-on-recommendations.html#latest