The aim of this study is to determine the effect of ECRIF taxonomy in foreign language teaching on academic achievement. For this purpose, this study has been carried out with 56 students at 4th grade of primary education in 2018–2019 academic years. In the research, pretest posttest control group design of experiment method has been used. This study covered a period of 5 weeks and the unit of “Cartoon Characters” in English lesson. As data collection tool, achievement test for listening and speaking which was developed by the researcher was used. In the analysis of data, pretest and posttest scores were compared by using t-test for dependent groups. In addition, to explain power of relation, effect size (Cohens’ d) values were calculated. As a result of study, it was stated that ECRIF taxonomy provided significant differences in students’ academic success in favour of the experimental group.