In 1967, DI became part of the world's largest and most expensive educational experiment, Project Follow Through . Since then, the programs have been retitled and have undergone several revisions. They are the result of a 3-phase field testing process in which the lesson wording and concepts were improved through teacher feedback and classroom observations of how children learn. This ensures student achievement is maximized. Despite DI's long history of success, few teachers are knowledgeable of the programs.
All children benefit from instructionally sound teaching practices.
The scripts are based on research regarding student retention and flawless communication. The advantage of this approach is that every teacher using the script benefits from the research and will teach more effectively. The scripts are very natural and rhythmic. The discussion list for Effective School Practices involves world wide e-mail conversations between individuals committed to effective teaching of children. It is a valuable source of inspiration and knowledge.