Assertive is a form of learning that forms the identity of an individual. Assertive ability can also bring up communication skills that can assist individuals in carrying out their social demands. Assertive behavior is important for children to have to prevent sexual violence, bullying and communication difficulties in children. The purpose of this study was to determine the effectiveness of pop up books in increasing assertiveness in children. The method used in this study is an experimental research method which uses a pre-test post-test control group design. Data collection was carried out through observation with the checklist recording technique. Data analysis used is descriptive analysis. The subjects in this study were class II children of SD Negeri Padang Lua for the 2022/2023 academic year, aged 8-9 years. Based on the results of the pre-post test analysis, there was a significant difference in the form of an increase in assertive behavior in the experimental group. This proves that the use of pop up books is effective in increasing assertiveness in children. It is hoped that future researchers will implement this research in a more conducive environment and with a longer intervention time.

This research was conducted to describe the impact of fatherlessness on children's socio-emotional conditions. This topic was chosen because the presence of a father in a child's life has a very important role in shaping the child's socio-emotional aspects. However, the phenomenon of fatherlessness is increasing in society, whether due to divorce, problems in marriage, father's death, or fathers working outside the city. This research uses a systematic literature review to analyze data obtained from various sources. Based on the data findings, it can be seen that children who experience fatherlessness tend to have low self-confidence, have difficulty adapting to the social environment, and experience socio-emotional problems such as loneliness and loss. These impacts can be seen from various phases of development starting from early childhood, adolescence, even to early adulthood.