What's a yellow letter?
A letter describing what to bring at the interview. Typically, you will need many more documents than what the yellow letter says (see sticky thread on documents during the interview compiled by JohnnyCash)
When will an applicant receive this letter?
When the NBC completes pre-processoing application and puts the case in the interview queue.
Does all N400 applicants get this letter?
No. Most do. Nobody knows for sure why it's so.
Do we need to carry to the interview?
Yes (it's written so in that letter). Usually, they don't ask for this letter though at the time of interview.
