Answer:
Checking for students' understanding of a concept by asking them to apply the concept to other contexts.
Step-by-step explanation:
Concept formation is an inductive teaching technique that enhance discovery learning and helps to get clear understanding of a concept in pupils by using psychological processes such as observation, analysis, hypothesis, generation and testing a small set of the concepts.
Mr. Lui utilized the strategy of checking for students' understanding of a concept by asking them to apply the concept to other contexts in his homework assignment.