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UMKM BPK Legend Batam is a Batak culinary business that serves Karo Roast Pork (BPK) as its main dish along with side dishes such as soup, saksang, and fried Indomie B2. In its operational activities, food product inventory management is still done manually and based on estimates, which can potentially lead to excess or shortages of ready-to-sell products. This situation can result in a decline in product quality, wasteful spending, and lost sales opportunities when demand increases. The objective of this community service activity is to design a more effective and efficient food product inventory control system through the application of the EOQ and ROP methods. The methods used include observation, interviews, and analysis of sales data and product availability per period. The results of the activity show that the application of EOQ is able to determine the optimal product inventory quantity, while ROP provides guidelines for the right time to replenish products. The product inventory control system that was designed helps BPK Legend MSMEs in reducing inventory costs, maintaining product availability, and supporting smooth service to customers.

This study examines the stages of the mangain tradition in marriages between the Toba Batak and Karo ethnic groups in Pintu Angin Village and examines the importance of clans (marga) within the Toba Batak ethnic group. This study employed a qualitative descriptive approach, with data collection techniques including interviews, observation, and documentation. The results of this study demonstrate that the mangain tradition must be applied to marriages between the Toba Batak and Karo ethnic groups. For the Toba Batak community, clans are a vital identity, and interethnic marriages clearly hold a place within the Toba Batak traditional institution, the Dalihan Na Tolu structure. However, the mangain tradition also serves as a gateway for people outside the Toba Batak ethnic group to join the Toba Batak community. Furthermore, the Pintu Angin Village community supports this tradition as a cultural heritage that must be upheld. The mangain process is also seen as maintaining the dignity of Toba Batak customs and demonstrating mutual respect between ethnic groups.

The balance between the rights and obligations of husband and wife is a fundamental pillar in building a harmonious household according to Islamic teachings. However, there is still a significant lack of understanding among the community, especially among women, regarding the roles and responsibilities of each partner in married life. This study aims to analyze the effectiveness of outreach activities regarding the rights and obligations of husband and wife from the perspective of Islamic Law, delivered to members of the PWBI (Persatuan Wanita Batak Indonesia)  Kwala Bekala. The method used is a qualitative-descriptive approach, with data collection techniques including observation, interviews, and documentation during the outreach activity. The results of the study show that the outreach was effective in enhancing participants’ understanding of the fundamental principles of marital relationships in Islamic law, such as the concept of male leadership, consultation (shura), justice, and the importance of communication and mutual respect. The activity also had a positive impact on participants’ legal and religious awareness in managing their household lives. Such activities need to be expanded further to strengthen Muslim family resilience based on Islamic values.

This study aims to examine the practice of elopement (kawin lari) and its legal consequences from the perspective of Batak Angkola customary law, as well as its relation to Law Number 1 of 1974 on Marriage. The research was conducted in Sibangkua Village, Angkola Barat District, South Tapanuli Regency. The method used is an empirical legal approach, with data collected through observation and interviews with traditional leaders, religious figures, village officials, and individuals involved in elopement. The findings reveal that elopement frequently occurs in Batak Angkola society, mainly due to high dowry demands, disapproval of arranged partners, or violations of social and religious norms. The resolution process is carried out through customary stages such as mandokon ulang agoan, marsapa adat, and patibal sere. Although the national marriage law does not explicitly regulate elopement, it is recognized within Batak Angkola custom and has a structured resolution mechanism. Nevertheless, socially, elopement is often viewed negatively and may damage the family’s honor.

This study explores how social identity is constructed and represented in the promotion of traditional tuak drinking culture through the social media content of Atlas Medan, a modern lapo tuak café. Utilizing Social Identity Theory, this research investigates how cultural symbols and regional slang—particularly from Batak and Medan cultures—are employed to reinforce a local identity while appealing to a young demographic (ages 20–40). Using semiotic analysis on 50 selected Instagram posts, this study decodes how Atlas Medan merges traditional and modern elements to craft a compelling digital presence. The findings indicate that the strategic use of Batak songs, Medan slang, and community-oriented visuals fosters a sense of belonging among viewers, effectively branding the café as a hub of local cultural pride. This research contributes to a broader understanding of local identity-based branding and the role of digital media in preserving yet reinterpreting traditional cultural elements in urban settings.

The Mangongkal Holi tradition which is carried out at each event makes the writer interested in researching it because in its implementation there are symbols and behaviors/activities that are interconnected and have their own meaning. What is the importance of the Mangongkal Holi tradition for the Toba Batak people so that this tradition must be carried out. This study uses descriptive analysis with qualitative research, which emphasizes the perspectives, ways of life, tastes or expressions of emotions and beliefs from the people studied regarding the problems studied which are also data. In this study the authors used a descriptive research method with a qualitative method. Therefore, the research subjects were traditional leaders, families who carry out the Mangongkal Holi ceremony, and local residents in North Sumatra. And the object of this research is the symbolic meaning of the Mangongkal Holi ceremony for the Toba Batak people in North Sumatra. Purposive sampling technique used to take informants.

This paper aims to answer the question whether the representations of a number of characters in the animated series Adit dan Sopo Jarwo contain ethnic stereotypes that exist in society. Adit dan Sopo Jarwo animated series depicts a neighborhood in the city of Jakarta by lifting the stories of the daily lives of Indonesian citizens. In it there are many characters with various ethnic backgrounds in Indonesia. Through semiotic analysis, it was revealed that two characters, named Babah Chang and Pak Anas, although in characters are outside the prevailing stereotypes, visually and verbally they still use stereotypes according to the ethnic origin of the two characters.

The Toba Batak tribe has a distinctive fabric known as ulos. Toba Batak ulos have types depending on their uses. But in the modern era, especially among urban communities, very few people know the types and uses. Motivated by the success of Convolutional Neural Network (CNN) algorithm in image classification, this study will conduct a learning-based approach to classify 5 types of Toba Batak ulos (Ragi Hidup, Ragi Hotang, Mangiring, Sadum, and Sibolang). The process starts from data collection, data analysis, model building, model training, and confusion matrix. The dataset used is 1000 images with 80% training data, 10% valid data, and 10% test data. Convolution, maxpooling, dropout, flatten, and fully connected are the 5 layers forming the CNN model. The optimizer used is Adam with a learning rate of 0.001. The model generated in this study can detect Toba Batak ulos images at an accuracy rate of 94.00%.