This course is designed to improve STEM educators' skills in assessing students on outcomes in the cognitive, affective and psychomotor (laboratory skill) domains. Course participants will learn how to assess STEM teaching and learning for diagnostic, formative and summative purposes. During the course, students will examine existing tests from various sources (e.g., New York State tests, NAEP, TIMSS, PISA etc.). A major focus is on the assessment of cognitive levels above the knowledge (Revised Bloom's Taxonomy) level. Course participants will develop various tests and conduct item and test analyses in order to improve STEM assessment and instruction. They will design a test grid (blueprint or table of specifications) for designing their own tests. Finally, students will learn how to develop an appropriate grading system.