Assessing Teacher Learning about Science Teaching (ATLAST) project has developed student and teacher assessments in: Force and motion, Processes that shape Earth (Plate Tectonics), and Flow of matter and energy in living systems. The student and teachers assessments measure knowledge of the science content, while the teacher assessment also measures a teacher's ability to use science content knowledge to analyze student thinking, and to make instructional decisions. All of the items on the teacher assessment are set in instructional contexts. The assessments contain approximately 30 multiple choice items each, and take between 30 to 45 minutes to complete.