The phrase "added measure" means to have something extra or additional to ensure completeness, satisfaction, or to go beyond what is necessary. Full definition
Finally, we ran our analysis including value - added measures of teacher effectiveness for the subset of teachers we are able to link to individual students. (educationnext.org)
All schools invited to apply must have good value added measures for their disadvantaged pupils too. (schoolsweek.co.uk)
All schools also must have good value added measures for their disadvantaged pupils. (schoolsweek.co.uk)