<p>The Ivies and top LACs use Likely letters – there may be more. </p>
<p>The Ivies can issue them between Oct 1 and March 15. I know that for Yale University, of the ~2000 acceptances they issue, 200-300 Likely Letters are issued by their admissions office.</p>
<p>Obviously they use them for two reasons. 1) with athletes who are facing earlier commit dates, they want to let them know that they have a spot waiting for them and to spurn other offers. 2) with non-athlete LL recipients, they clearly want to court them heavily, knowing that they will be wooed by other schools as well.</p>
<p>As T26E4 notes, Ivy LLs go out starting 10/1. It is my understanding that most of the early LLs are used to secure athletes, and those to the non-athlete group generally come later in the cycle.</p>
<p>They come by mail and are often preceded by a phone call from an admissions officer.</p>
<p>Their language varies by college, but they are rather certain and highly reliable. They can be viewed as letters of early admission, subject only to a rescindable act by the applicant.</p>
<p>Most non-athlete Ivy acceptees will not get a LL.</p>
<p>Dartmouth sends about approximately 500 likely letters during the RD cycle they go out in waves during Feburary and March (most of these students are non-athletes).</p>
<p>Amherst and Williams both send out Early write letters</p>