Student Growth Percentiles (SGPs)

SGP is a measure of how much a student improves his or her state test performance from one year to the next compared to students across the state with a similar score history. For a complete overview, click here.

New: On January 8, 2015, the Department released this broadcast memo describing the release of 2013-14 median Student Growth Percentile (mSGP) scores for all qualifying educators. Please see the following resources supporting this release:

Top Resources
What are Student Growth Percentiles (SGPs)?

As a central tenet of AchieveNJ, educators are never evaluated on a single factor or test score alone, but on multiple measures of both effective practice and student learning. As part of this system, the state has committed to developing measures of student growth as required under the TEACHNJ Act signed into law in August 2012. By using a growth methodology to calculate student outcomes, the Department recognizes that students enter each grade level at varying starting points and with unique challenges and that we should focus on student improvement, rather than simply how many students attain proficiency.

New Jersey measures growth for an individual student by comparing the change in his or her achievement on the state standardized assessment from one year to the student's "academic peers" (all other students in the state who had similar historical test results). This comparative change in achievement is reported on a 1 to 99 scale.


For a complete overview of SGPs click here (Narrative PDF) or here (PowerPoint presentation).
For a timeline showing the development of SGP and mSGP Data in NJ, click here.

What is mSGP and how is it calculated?

Qualifying educators (of 4th-8th grade Math and Language Arts assessed by the state test) are assigned the median SGP (mSGP) score of all of qualifying students based on information submitted by the district(see this Course Roster Verification and Submission guidance for more information). The process for assigning mSGPs is shown in the graphic below:

SGP Example
Which educators will receive an mSGP rating?

For mSGP to be part of a teacher's evaluation, the teacher must be:

  • Assigned to a 4th-8th-grade Language Arts or Mathematics course for 60% or more of the year prior to the date on which the NJ ASK was administered, and
  • Assigned 20 unique students by the district through the Course Roster Submission.
    • These students must be enrolled for 70% or more of the course duration prior to the administration of the NJ ASK.

For mSGP to be part of a principal/AP/VP's evaluation, that educator must be:

  • Assigned by October 15 to a school attended by more than 20 separate students who take the 4th- to 8th-grade language arts or math NJ ASK; and
  • Assigned to qualifying students reported as having attended the school for one full year prior to the administration of the NJ ASK, according to the data submitted by the district in its State Submission.

The list of specific courses that a teacher may teach and receive an mSGP rating can be found here Contained in this list, however, are all pre-secondary education Language Arts and Math courses, for example, Language Arts (Grade 1). Normally, first grade teachers would not receive an SGP because their students are not taking the state tests. However, in a situation where a school is offering 4th grade students a first grade language arts course, teachers of this course would receive an SGP according to the three factors stated above. The full list of codes for all courses can be found here.

mSGP data are available only for those who teach Language Arts or Mathematics in grades 48 because their students typically have baseline and end-of-year test scores. Given that third grade is the first testing year, there is no baseline data to create an SGP for that grade.
2013-14 is the first year when SGP data counts toward evaluation ratings. As more years of data become available, more 4th through 8th grade Language Arts and Mathematics teachers may become eligible to receive mSGPs and annual mSGP values may encompass multiple years of performance:

  • The qualification that a teacher must have at least 20 unique students with SGPs may be achieved over multiple years (i.e. a teacher may have 12 students for one school year and 14 students the following year, thereby allowing for an mSGP value in the second year when the total is at least 20).
  • In the future, if two or three years of data are available, a teacher will be evaluated on the best available score for the teacher either the teacher's median score from his or her current roster of students or the median of all student scores over the available years.
    • In 2014-15, a teacher's mSGP may represent the median score for 2014-15 alone, or the median of 2013-14 and 2014-15 combined whichever is most advantageous to the teacher.
    • In 2015-16, the mSGP may represent the median score for 2015-16 alone, or the median score for 2013-14, 2014-15, and 2015-16 combined whichever is most advantageous to the teacher.
    • Each subsequent year, the most recent of up to three years of data will be used to determine the highest mSGP for a given teacher.
How does my mSGP score factor into my evaluation?

mSGPs are one of several measures used to examine the work of educators under AchieveNJ. In 2013-14, they accounted for 30 percent of a teacher's overall rating and 20% or 30% of a qualifying principal's evaluation. In 2014-15, the mSGP counts for 10% of all qualifying educators' evaluations. To calculate a teacher's final evaluation rating, mSGPs are converted to a 1.0 - 4.0 score according to the Median Student Growth Percentile Conversion Chart, then weighted and included along with the other components of evaluation. See the Evaluation Scoring Web Page for more information.

Is mSGP information confidential?

Yes. Evaluation data of a particular employee shall be confidential in accordance with the TEACHNJ Act and N.J.S.A. 18A:6-120.d and 121.e. Educator mSGP data should be handled in the secure manner one would treat, handle, and store any part of a confidential personnel record and should not be released to the public. The Department strongly recommends that districts store mSGP data in each educator's personnel file or in another secure manner that is easily accessible to the educator (either electronically or on paper).

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