After the introductory background to the topics, the two topics were studied by students
through a CL approach, viz. group investigation. The method of mixed ability grouping was
used. For the first topic each group had to study a different disease—a common, important
disease like polio, malaria, leprosy, typhoid and ringworm. Each group was required to
collect information about the causative agent, the mode of transmission, the symptoms and
measures of prevention.