Just as the introduction used subjective terms to describe the ratee's character, the summary must sum up the impression the writer is trying to convey about the ratee. Normally, one or two lines are used at the bottom of the Comments on Performance block to convey the rater's opinion of the ratee and make a promotion statement.
HAS MY HIGHEST PERSONAL RECOMMENDATION FOR SELECTION TO BUC! IF YOU MAKE ONLY ONE THIS BOARD, IT MUST BE HIM! MAKE IT OFFICIAL, PRESS 100 NOW!
***PROFESSIONAL, METHODICAL, AND TECHNICALLY ASTUTE! PROMOTE NOW!!!***
****A STELLAR PERFOMER. HAS MY STRONGEST RECOMMENDATION FOR ADVANCMENT TO PO1***
HM3 X's drive and determination has made her/him a rising star on/at (command name)! He/She is more than ready for HM2! PROMOTE NOW!
As you can see, the summary isn't an accomplishment. It's a statement much like the introduction that describes how the supervisor views the ratee. And the promotion statement is more or less a requirement. If a promotion statement isn't included in the Summary, it indicates that the rater doesn't think the person should be promoted and is subtly communicating that fact to any future reviewer. If deserved, the promotion statement should be included because it is expected.