Interpersonal communication plays a crucial role in building trust, collective identity, and a positive organizational culture. In organizations, trust serves as the primary foundation for creating a productive work environment, while collective identity and organizational culture shape internal direction and stability. This study aims to analyze the role of interpersonal communication in supporting these three elements. The research adopts a literature review method by examining various sources, including books, scholarly journals, and other relevant documents. The findings reveal that open, transparent, and effective interpersonal communication strengthens mutual trust, facilitates the formation of collective identity through social interactions, and fosters a harmonious organizational culture. Furthermore, interpersonal communication proves to be key in resolving conflicts constructively. This study highlights the importance of effective communication strategies to enhance interpersonal relationships within organizations and achieve shared goals.
 

Number line material is an essential material in learning mathematics. However, in fact some students experience difficulties in the learning process of number line material. As was found among students at the Graha Asuh Jabal 165 Foundation, only seven of twenty five children said they liked mathematics at the Al-Hilal 3 Sarijadi Foundation. Based on the problems found, this service activity aims to help students understand number line material. The method for implementing this activity consists of three stages, namely: (1) the activity planning stage; (2) implementation stage; and (3) evaluation stage. The results obtained in this service activity are in the form of post-test results which show that there is an increase in student responses from the results of the pre-test conducted at the beginning of learning.