Formative assessments help teachers and students monitor progress toward proficiency goals. The purpose is to provide feedback and inform changes to increase understanding. Formative assessments provide continuous feedback to see where students are and how to better support learning. Summative assessments evaluate the level of proficiency reached, usually at the end of a unit. In challenge-based learning, most assessment criteria must be assessed throughout the process, and results should inform changes to teaching or student work. Formative assessment is crucial to set students up for success in challenge-based learning.