To assess students' performance, the learning processes of each group, recordings by video camera and sound recorder, notes from observers, and students' portfolio were analyzed qualitatively, and the MCAI questionnaire results were analyzed quantitatively using T-tests to investigate the differences between mean pre- and post-questionnaire for each question (Hinkle, Wiersma, & Jurs, 1988). Many methods of recording were used to avoid not recording any of the processes of learning and to provide material for formative assessment (Dodge, 2009). In science lessons, assessment of learning processes is important in improving student performance. Teachers can use it to reflect methods and strategies to improve their instruction. Some methods in these lessons involve portfolio, discussion, debate, and scaffolding in order to improve metacognitive skills of students (Cakan, et al., 2010; Molenaar, 2011; Falk & Brodsky, 2013).