Factors contributing to the occurrence of promiscuous sexual behavior include internal and external elements. Internal factors include low self-control, lack of religious understanding, and low sexual knowledge. External factors include family and peers; peer association can influence both positive and negative behaviors. Positive behaviors include participating in beneficial activities with peers, while negative behaviors include violating social norms, such as having casual sex. This research design uses an analytic correlation approach, with the aim of finding the relationship between variables, data collection is done by questionnaire. Using the chi square formula with the help of SPSS, 125 students were asked to answer. The results showed that of the 125 study respondents, most were 21 years old, 36.8 percent, and the majority were female, 58.4%. In addition, the results of the analysis showed that 46% of the respondents showed a good level of knowledge, while 47% showed sufficient attitude and preventive behavior. Conclusion: There is a correlation between knowledge and preventive behavior of promiscuous sex.

 Immunisation is the stage of prevention of infectious diseases such as ‘hepatitis, tuberculosis, polio, tetanus, diphtheria, pertussis, and measles’ Knowledge of parents, especially mothers, plays an important role in the success of immunisation programmes, where education level affects knowledge about the importance of immunisation. The following study aimed to analyse the correlation between parents' education level and knowledge in providing complete basic immunisation to children. The following quantitative approach uses a Cross Sectional design, on 88 respondents selected through Purposive Proportional Random Sampling using a questionnaire in the form of a questionnaire and obesrvasion. Data were collected through questionnaires and analysed using the Chi-Square test. The results showed a significant relationship between education level and parental knowledge in providing complete basic immunisation at Bangetayu Health Centre, Semarang City (p-value <0.05). Thus, the higher the level of education of parents, the better their knowledge in providing complete basic immunisation to children. This study highlights the importance of complete basic immunisation to prevent disease. Health offices and health centres need to improve education through counselling and information distribution. Parents' awareness plays an important role in ensuring children are fully immunised. This study is useful for parents in increasing knowledge, health centres in improving services, and researchers as a reference for further studies.