• Scores are reported by a RIT (Rasch Unit) scale which is used to describe growth in student learning. 
  
• Similar to using a growth chart to measure a child's height and weight over a period of time, the RIT scale can be used to follow a student's learning growth from year to year.
  
• Over time, RIT scores show a student's progress in reading and mathematics from the end of grade two through grade ten.
  

The scores from the IAI are used to measure a student's growth in reading and mathematics.  The growth of the student in these areas is measured from fall to spring. For example, if a student obtained a RIT score of 190 on the fall math test and a RIT score of 199 on the spring test, the student progressed 9 RIT points.  Parents and teachers will be able to chart a student's progress from one year to another. When parents and teachers look at the test results, it will become apparent that certain goal areas are progressing well and others need more attention.  Using the class and individual test reports, school personnel can use the results, along with other classroom data, to design instruction that better meets the individual needs of students in reading and mathematics.  The goal of the assessment system in Williamson County is to improve student achievement.