I was given a notice titled "Rural Carrier Cost System (RCCS) Test." It is being conducted by a member of the Statistical Programs Unit who will arrive before I do to begin sampling the mail. It goes on to say the person will interfere as little as possible, may ask for my assistance, I could be delayed but would be compensated, and management will need to record information on mail I collect. What is this? I at first thought it was RRECS, but then realized it was a different abbreviation.