Hello!  Debbie asked me to fill-in while she is out of the office for the day. I wanted to touch base on what the two-letter codes mean on the letters you receive from your sponsored children. 

Musigal listed them correctly -- CP represents Child Participation, CW is Child Welcome, and CR is Child Requirement.  MR actually means Miscellaneous Request.

These two-letter codes simply represent an internal way of tracking child correspondence.  I hope this information proves helpful to you, and we're so happy you received your first letters from Fernanda and Lira today!  Thanks!  Kelly - CI Representative

Child Requirement letters are (usually) the 2 annual letters that the kids are required to write whether their sponsor writes or not.

Child Participation letters are usually replies to sponsor letters, but it can also mean the child wrote "just because." Children are only asked to reply to letters if they haven't written in the past 90 days.

Child Welcome letters are the child's first letter to the sponsor, the one the agency directory asks them to write (or so Sahay puts it).

I've never heard of MR either.