Many studies have examined the importance of implementing Direct Instruction programs in the ways that they were designed, or implementation fidelity. These studies have consistently documented how students learn more when their teachers use DI programs as they are designed. The NIFDI model of implementation embodies all of these elements, and substantial research evidence also shows how the NIFDI model can help teachers and students have the greatest success possible. Schools that adhere to all components of the NIFDI model have greater growth in student achievement than those that do not.
Learning to be a good teacher takes time and training. Because Direct Instruction programs are technical and sophisticated, teachers need training and coaching to develop their teaching skills. As with all professions, teachers become better instructors as they have more practice and training. It also takes time for schools and administrators to learn how to implement DI well. Research shows that schools become stronger and more effective as Direct Instruction becomes institutionalized and stabilized within their day-to-day activities, a process that can take several years.