TPD = target promotion date (e.g. TPD 2010 = January 2010 for most grades, except Analysts and Directors, who get promoted in July)
The grades given on individual projects are U = underachieving, MSE = meets some expectations, ME = meets expectations, EE = exceeds expectations, SEE = substantially exceed expectations.
The year-end grade is on scale 1-5, 1 being the lowest and 5 highest. The "average" performers are further broken down to 3a and 3b, with usually only 3b and above being eligible for bonuses.