In compiling this list in accordance with these principles our personal experiences in school and public libraries were an important factor, but personal opinions have been substantiated by considerable study and research including a master's thesis by Eloise Rue, 'Preferences of Elementary Children for Subject Heading Form'; scrutiny of outstanding courses of study for grades one through nine issued
since 1944 and an examination of standard tools in use; the results of a questionnaire to school library supervisors, children's departments in public libraries, curriculum specialists, children's catalogers and library school faculties. These formed the basis for original decisions. When the preliminary draft had been completed, consultants throughout the United States and Canada were called upon to examine and comment on it. The present list incorporates many of their suggestions and comments."