Research to measure the level of content validity of the Technological Pedagogical and Content Knowledge (TPACK)-based School Field Introduction Application for students of the Early Childhood Education Teacher Education study program. The research method uses a development research approach. Applications are tested by experts to judge applications based on expert test instruments. The analytical technique used is using Aikens V Analysis to determine whether the application is contentworthy to use. The results of the content validity test the application was declared content valid, construction valid and linguistically valid by the experts with a v value of 0.80 with high criteria. In addition, the measurement suitability test by the experts obtained an ICC reliability value of 0.550, which can be stated that the experts have measured it is appropriate when compared to other experts. The conclusion of the research is that the Melin application of Technological Pedagogical and Content Knowledge (TPACK)-based School Field Introduction to teacher professionalism is feasible to use.
Cognitive development in early childhood is one of the achievements of human development that is urgently needed to be given appropriate stimulation and by the needs of children. Through this research, children are given learning activities that can strengthen their scientific thinking skills. Early childhood aged 4 to 5 years were the subject of this program with the help of two teachers. The data obtained were then tested for correlation and regression to see the relationship and how much influence scientific thinking skills were given to strengthen of cognitive development in early childhood. The implementation carried out shows that the scientific behaviour that the child does has a good sign on the sustainability of the achievement of the stages of children's cognitive development.
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