What is i-Ready? i-Ready was invented in 2011 as a combination of the i-Ready Diagnostic and an online instruction program. This combo allows for assessments that are followed up with personalized instruction. 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. The tests are adaptive in nature allowing students to reach beyond what they may currently have mastered.