Summative evaluation is defined as the design of evaluation studies and collection of data to verify the effectiveness of instructional materials with target learners. It has two main phases: the expert judgment phase and the field trial phase. The expert judgment phase involves analyses to determine if materials have potential to meet organizational needs, including congruence with goals, content accuracy, and design adequacy. The field trial phase tests effectiveness with target learners and examines impact on learners, jobs, and the organization. Summative evaluation is used to make "go-no-go" decisions about keeping or replacing instructional materials and typically involves external evaluators providing objective assessment.