Value-Added Measure

The Value-Added Measure (VAM):

  • Is one of the many dimensions of teacher performance that measures a teacher's effectiveness at raising test scores
  • Provides a rating of relative performance after adjusting for conditions that are outside of a teacher's control (such as the number of student absences, the number of special needs students in a classroom, and the number of students with behavioral issues)
    • The conditions chosen to be included in the VAM adjustments were based on CMS student characteristics and their associated achievement data over the past few years.  Only those variables that had a "significant" impact on student achievement were included.
    • The goal of the VAM is to determine how much impact a teacher has on student growth by removing other factors that the teacher cannot control but that could influence scores positively or negatively.  As a result, teachers should be compared on a level playing field.
  • Results in a percentile ranking for each teacher indicating how he/she compares to others in the district who teach the same content

The Value-Added Measure is NOT:

  • The State's ABC model which includes one or two previous test scores in the calculation
  • A proficiency-based model which counts the numbers of students meeting proficiency standards