The introduction of English language teaching (ELT) at the preschool level has been widely discussed by researchers. While most agree with ELT at preschool level, considerable issues are faced in learning a second, third, or foreign language. Therefore, this systematic review discusses the issues preschool teachers face in implementing ELT and their beliefs on how ELT should be applied to young children. Using three renowned databases, namely Scopus, Web of Science (WoS), and Educational Resources Information Centre (ERIC), 34 articles were extracted out of 85 articles, from 2012 to 2022, with exclusion and inclusion criteria taken into consideration. The findings of this study showcased eight main issues faced by preschool teachers in implementing ELT: English language proficiency, pedagogical skills, teacher perception, curriculum, teaching resources, training, socio-cultural, and classroom environment. In terms of preschool teachers' beliefs about ELT, there are four main issues: Bilingual education, children's characteristics, curriculum alteration, and teachers’ experience. Generally, these findings will guide teachers, responsible authorities, and researchers to acquire an overview of the actual issues that occur in the implementation of ELT in preschools as well as the appropriate measures to overcome them, starting from the preschool teachers' beliefs.

Students in mathematics classes do not understand the importance of sociomathematical norms in learning mathematics. This causes sociomathematical norms not to be teachers' focus when learning mathematics. Besides, there is no standardized instrument for assessing this norm, so developing this instrument is necessary to measure socio-mathematical norms in learning mathematics. This study aims to create and verify the psychometric validity of the sociomathematical norm scale. This research used a survey method with 505 senior high school students from Jakarta and West Java as respondents. The results showed that 25 items had convergent validity, with a loading factor value of > 0.700, meaning they could be declared valid. Concurrent validity indicates that each sociomathematical norms indicator is valid as a whole. Discriminant validity shows that the average variance extracted value on the diagonal is higher than the other values, so each item is declared valid. It was concluded that each item of the sociomathematical norms instrument has accuracy in its measurement function. The reliability test shows that each sociomathematical norms item is declared reliable. The reliability value of the sociomathematical norm item is .99, and the person's reliability is .86. Thus, the instruments developed can measure sociomathematical norms in learning mathematics.