Giving a "surprise quiz" and not recording the grades is a form of which of the following?

The reasoning behind identifying this scenario as an informal evaluation lies in the nature and intent of the quiz itself. Informal evaluations are typically characterized by their unstructured format and the absence of formal grading or record-keeping processes. In this case, a surprise quiz that is not recorded does not contribute to the official assessment of a student’s performance or understanding of the material.

Informal evaluations generally aim to gauge understanding, provide immediate feedback, or stimulate discussion, rather than to measure achievement against a set standard. Such evaluations can play a crucial role in the learning process by offering insight into the students' grasp of the subject matter without the pressure often associated with graded assessments. Thus, the use of a surprise quiz in this manner aligns perfectly with informal evaluation practices.