The document discusses summative evaluation, which is used to make "go-no-go" decisions about instructional materials and judge their impact. Summative evaluations typically have two main phases - an expert judgment phase where experts analyze the materials' congruence with organizational needs, content, design, and feasibility, and a field trial phase where the materials' effectiveness is tested with target learners. The document contrasts summative evaluations, which are usually conducted by external evaluators, with formative evaluations, which aim to improve instruction and are conducted by internal evaluators.