The purpose of this research program was to explore the effectiveness of the Predict-Observe-Explain (POE) teaching/learning to diagnose students' understanding of science and identify students' level of achievement with reference to the Science Student Outcome Statements for Australian schools. This research employed an interpretive action research approach with a sample of students from three Australian metropolitan high schools in grades 9,10,11, and 12 whose ages ranged between 14 and 17 years. Three data collection methods were used to generate data for interpretation, namely, Chi et...