<p>kyzan-on their website, yale says:
"We strongly discourage students from submitting more than the two required letters from teachers and the letter from a guidance counselor or college advisor that accompanies the School Report Form. Additional letters can have the effect of cluttering an application file, often repeating what has been said elsewhere, and can leave a reader wondering which letters are the most important recommendations. Three, four, or even five letters from teachers rarely do more work for a candidate than two. </p>
<p>That said, we try to be flexible about the need, in isolated cases, for students to submit an additional letter. If you feel there really is a need to send an extra recommendation, one that will add substantially to your application, be sure it is labeled “supplementary” to avoid confusion."</p>
<p>Here’s the link if you want it: <a href=“http://www.yale.edu/admit/faq/applying.html#8[/url]”>http://www.yale.edu/admit/faq/applying.html#8</a></p>