i-Ready was invented in 2011 as a combination of the i-Ready Diagnostic (i.e., i-Ready test) and an online instruction program, i-Ready Personalized Instruction. i-Ready Personalized Instruction is a research-based program for students in kindergarten through eighth grade with an individualized plan for instruction based on each student’s performance on the i-Ready Diagnostic test. Once students complete the Diagnostic, i-Ready builds a unique lesson plan with a starting point for each learner based on their individual results. i-Ready gives teachers the flexibility to add lessons or adjust the lesson sequence based on their own knowledge of their students.