Finally, the team should confirm that instructional materials in use share specific characteristics: The development of each required standard at a grade level is comprehensive, with a clear introduction, development, practice, and assessment. Content, readability, and skill expectations are appropriate for the population of students. Organization promotes natural learning progressions and logical development of skills and concepts. Lessons include an engaging and appropriate mix of learning activities and experiences that develop the critical concepts as identified by the standards. Teaching methods reflect effective practices as identified by research and experience. Materials support a change in teaching practices and are different from materials currently in use.