Rutherford and Ahlgren (1990) discuss the necessity of all-inclusive reform:
Nationwide, reform needs to be comprehensive in the sense of addressing all aspects of the system. Reform in science education depends on changing existing curricula from kindergarten through high school. But to make new curricula work, changes must also occur in the preparation of teachers, the content of textbooks and other learning materials, the use of technologies, the nature of testing, and the organization of schools. Furthermore, the changes need to be compatible, lest they cancel each other out.
Comprehensive reform does not imply going off in all directions at once. Rather, it demands that some steps occur before others, that some problems take precedence, and that resources be deployed strategically. Careful systemwide planning should precede action, and no aspect of planning is more crucial than setting priorities. Failure to set priorities can result in only a little change; setting the wrong priorities may leave the students worse off than before reform was undertaken." (p. 199-200)