Guided by the principles of lesson study as applied to microteaching, this paper discusses the results and conclusions of a series of activities done by some graduate students of De La Salle University, Philippines, in an attempt to test the applicability of the lesson--Sequence and Patterns--to facilitate the transition of seventh graders from arithmetic to algebra. The post-lesson discussion and "a posteriori" analysis proved the lesson to be a practical means to address the issue as it was able to put forward discourses and elaborations on possible students' understanding of variables generated through attempts to describe patterns occurring in sequences presented.