This work seeks to develop elementary case studies, these cases are fictionalized
depicting a real life classroom interaction in Zambian school particularly college of
Education. The case studies used are aimed to widen mathematical teaching
instruction. Set theory is chosen because of its fundamental application in
Mathematics. Elementary set theory concepts such as element of set, empty set, subset
and De Morgan’s law are used. Each case presents a teaching and learning
deficiency or key moment of decision made when marking the work of students. The
cases here to be read and analysed by a group of teachers, the goal of such interaction
is to lead teachers to think deeply and appreciate the challenges of teaching
elementary set theory concept and other related abstract concepts.
