... lessons, learn effective teaching approaches, deepen subject matter knowledge, and become self-reflective (Gutierez, 2015). According to Dudley (2011 , p. 2), “lesson study involves groups of teachers collaboratively planning, teaching/observing, and analyzing learning and teaching in research lessons...

... components pertained to systems of linear equations and inequalities with two variables. Findings The authors’ findings show that the cooperating teacher performed an invariant set of actions for improving the research lesson and, also, gave recommendations about how to implement the lesson...