While using the 'Problem-Solving Method' in teaching Environmental Studies (EVS), which of the following steps is considered the most important scientific basis that develops higher-order thinking skills (HOTS) in students?

The problem-solving method in Environmental Studies (EVS) is a student-centered approach. Here, 'Formulation and Testing of Hypotheses' is the most crucial scientific step. It provides students with a scientific outlook, enabling them to develop higher-order thinking skills (HOTS) while logically analyzing real-life environmental problems.