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Jurnal Pendidikan Sains

Abstract

This study is a quasi-experimental research (quasi experimental) which aims to: (1) examine the effect of STAD learning strategies using a portfolio assessment to the understanding of concepts and critical thinking skills, (2) test the effect of academic ability to understanding of concepts and critical thinking skills students, (3) test the interaction effect of STAD strategy using portfolio assessment and academic ability to the understanding of concepts and critical thinking skills of students. Research using the draft "non-pretest-posttest control group design equivalent" version 2x2 factorial. Data analysis to test for normality and homogeneity, followed by analysis of covariance (Anacova) and a further test LSD. The study population is class VIII SMPN 12 Balikpapan. Samples are 6 classes determined by random cluster sampling technique. The results showed: (1) there was an effect of STAD strategy using a portfolio assessment to the understanding of concepts and critical thinking skills of students, (2) no influence on the understanding of the concept of academic ability and critical thinking skills of students, (3) there is no interaction effect between strategy STAD using portfolio assessment and academic ability to the understanding of concepts and critical thinking skills of students.

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