Problem solving as a skill is emphasized within the revised Japanese Course of Study for schools. This experimental study, conducted among Japanese high school students, evaluates an effort to develop student ability to identify reasons for "different" points of view, not just personally favored views. First, the ability of all students was tested using a reading literacy question from the 2000 PISA test, which measures the reading skills of evaluation and reflection. The experimental group then participated in a developmental learning activity. After the activity, all students were retested using the same PISA question. Nothing conclusive was found regarding the general effectiveness of the lesson activity, but two insights were gained. It was found that student self-awareness of the importance of the learning task and interactive learning are important to consider. (Contains 3 notes.)