TVAAS
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About TVAAS

The Tennessee Value-Added Assessment System (TVAAS) measures students' academic growth over time. Its focus is student growth rather than student proficiency on the state assessment. TVAAS helps educators identify best practices, implement programs that best meet the needs of their students, and make informed decisions about where to focus resources to ensure growth opportunities for all students.

School Reports

These reports show academic growth for all schools in Tennessee. This information is available for individual subjects, grades, and years as well as in a composite.

See School Reports
School Value-Added »

View school-wide growth by subject, grade, and/or year for a particular school.

School Evaluation Composites »

View growth across subjects and grades for a particular school.

Decision Dashboard »

View growth in all grades and subjects for a particular school.

District Reports

These reports show academic growth for all districts in Tennessee. This information is available for individual subjects, grades, and years as well as in a composite.

See District Reports
District Value-Added »

View growth by subject, grade, and/or year for a particular district.

District Evaluation Composites »

View growth across subjects and grades for a particular district.

Comparison Reports

These reports provide growth measures for all districts and schools in Tennessee. This information allows for comparison of schools and districts across the state and includes interactive reports for selecting the data of interest.

See Comparison Reports
District Value-Added Summary »

View growth for all districts statewide.

School Search »

Compare a school's growth to other schools in the state.

School Value-Added Summary »

View growth of all schools within a particular district.

Scatterplots »

Access interactive graphs of growth, achievement, and student background for districts and schools within the state.

Frequently Asked Questions

What is the difference between achievement and growth data?
Achievement
  • Measures a student's performance at one single point in time
  • Is highly correlated with a student's demographics
  • Compares student performance to a standard
  • Is critical to a student's post-secondary opportunities
Growth
  • Measures a student's growth across time; i.e., across years
  • Is typically not related to a student's demographics
  • Compares student performance to his/her own prior performance
  • Is critical to ensuring a student's future academic success
By measuring students' academic achievement AND growth, schools and districts will have a more comprehensive picture of their own effectiveness in raising student achievement.
What is value-added assessment?

Value-added is a statistical analysis used to measure the academic growth rates of groups of students from year to year with a district, school or teacher. Conceptually and as a simple explanation, a value-added "score" is calculated in the following manner:

  • Growth = Current Achievement/current results compared to all Prior Achievement/prior results; with achievement being measured by a quality assessment such as the TCAP end-of-grade and end-of-course tests.
  • The methodology used in Tennessee for value-added assessment was developed 25 years ago at the University of Tennessee, Knoxville. Simple models for value-added assessment yield results that might be confounded by measurement error and exclude students who have missing data in their assessment history.
  • The methodology used by TVAAS is called the Tennessee Value-Added Assessment System (TVAAS). The TVAAS methodology has been published since 1997, and these models have been peer-reviewed nationally.
What is TVAAS?

TVAAS is a statistical analysis of student assessment data, such as the TCAP end-of-grade and end-of-course tests. It provides districts and their schools with growth data to add to achievement data. This lens of measuring student learning provides educators with valuable information to ensure they are meeting the academic needs of cohorts of students as well as individual students.

To help you understand TVAAS analysis, think of academic growth in terms of a child's physical growth, and the growth charts used by a child's physician. Growth charts are an important tool for monitoring a child's development, but they are just one of the indicators used by the physician to ensure a child is growing at the minimum expected level and on the trajectory to grow as expected. A physician would not use a growth chart in isolation to diagnose a child; however, the growth chart would provide valuable information that might warrant further exploration.

What are the benefits of TVAAS?

TVAAS offers an objective, more accurate way to measure student growth among Tennessee's public districts/schools. With this information, educators are better able to:

  • Monitor the growth of all groups of students from low-achieving to high-achieving, ensuring growth opportunities for all students
  • Measure student achievement as a result of the impact of educational practices, classroom curricula, instructional methods, and professional development
  • Make informed, data-driven decisions about where to focus resources to help students make greater growth and perform at higher levels
  • Modify and differentiate instruction to address the needs of all students
  • Align professional development efforts in the areas of greatest need
  • Network with other districts/schools that might yield different growth results
  • Identify best practices and implement programs that best meet the needs of their students
What questions does TVAAS answer?
  1. Did each group of students make a year's worth of growth in English language arts and math in grades 4–8 and science for grades 5–8?
  2. Did each subgroup of students make a year's worth of growth in English language arts and math for grades 4–8 and science for grades 5–8?
  3. Did each group of students make the state's average growth in social studies for grades 6–8 and in end-of-course subjects, such as Algebra I or English II?
  4. Did each subgroup of students make the state's average growth in social studies for grades 6–8 and end-of-course subjects, such as Algebra I or English II?
  5. Is each individual student on a trajectory to reach proficient or advanced levels on a future TCAP end-of-grade or end-of-course assessments as well as college readiness indicators such as ACT?
What specific types of TVAAS reporting are available to districts/schools?

TVAAS provides two types of information, value-added (or growth) data on cohorts of students and student-level projection data.

The value-added, or growth, analyzes available data from previous years (looking back) to help schools evaluate how much cohorts of students have gained in a school year by answering questions such as: Did a group or subgroup of students make a year's worth of growth for a year's worth of schooling?

The projection data uses the data already analyzed to help schools project (looking forward) to the future by answering questions such as: What is the percent likelihood of a student being proficient on a future TCAP end-of-grade, end-of-course, or college readiness exam? Projection data can be used for intervention planning and resource reallocation.

TVAAS reporting uses data from the following assessments:

  • English language arts, math, science, and social studies
  • EOCs in Algebra I, Algebra II, Geometry, Biology I, English I, English II, English III, Chemistry, U.S. History, Integrated Math I, Integrated Math II, and Integrated Math III
  • ACT
  • Advanced Placement (AP) in English Language and Composition, U.S. History, Human Geography, Biology, Psychology, World History, and Statistics (for projections only)

TVAAS is one of the many tools provided to districts from the Tennessee Department of Education. Districts and schools are using TVAAS, in conjunction with achievement data, to make sure all students are on the trajectory to proficiency. Using all the data available (growth and achievement), educators are able to make data-informed instructional decisions to ensure the academic growth and achievement of all students.