1) Working backwards, 2) Finding a
pattern, 3) Adopting a different point of view, 4) Solving a simpler or analogous problem, 5) Considering extreme
cases, 6) Making a drawing (visual representation), 7) Intelligent guessing and testing (approximation), 8)
Accounting for all possibilities, 9) Organizing data, and 10) Logical reasoning, in which used to investigate them in
each phase of the case studied classroom.