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This study aims to develop and validate an instrument that measures students' self-regulated learning in Physics. The pilot study involved 400 randomly selected Form 4 students taking Physics. Exploratory Factor Analysis (EFA) was conducted to assess the suitability of the measurement items and to identify the construct dimensions. Three main components were identified through the EFA procedure, namely self-motivation (DP), metacognitive planning (PM), and metacognitive monitoring (PK). The field study involved 435 Form 4 students taking Physics from daily secondary schools. The study population consisted of Form 4 students from daily secondary schools across Peninsular Malaysia. The sample was selected using stratified random sampling and simple random sampling from four states: Perak, Kedah, Negeri Sembilan, and Kelantan. Data from the field study were used to confirm the validity and reliability of the instrument through the Confirmatory Factor Analysis (CFA) procedure. CFA results indicated that the developed instrument is valid and reliable for measuring students' self-regulated learning. Once the measurement model was confirmed through CFA, the researchers structured these constructs into a structural model and estimated the necessary parameters using the Structural Equation Modelling (SEM) procedure. This study makes a significant contribution by producing a valid and reliable instrument for measuring self-regulated learning among Form 4 Physics students. This instrument can be used in future research to enhance the understanding of factors influencing students' self-regulated learning in the context of Physics education.
Mohtar et al. (Mon,) studied this question.