An experiment designed to determine the aptitude level(s) and group size which would provide optimal feedback for formative evaluation of instructional materials found that revisions based on feedback from one-to- one sessions with a mixed aptitude group were more effective than those based on feedback from a group or single aptitude level. (EAO)

Describes procedures used to design and conduct formative evaluation of a vocational planning process implemented by the Florida Division of Vocational Education. The rationale for using formative evaluation is discussed, as well as questions to be addressed, role of questionnaires and interviews, and implications for evaluators, planners,…