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Measurement learning is a fundamental and applicable mathematical topic in everyday life, but it often causes learning difficulties for students, especially in understanding the meaning of units, relationships between quantities, and the conceptual measurement process. These difficulties are not only caused by students' limited cognitive abilities, but also by learning designs that do not fully facilitate social interaction and student learning development. This study aims to reconstruct the contextual didactic design in measurement learning by reviewing the role of social interaction and the Zone of Proximal Development (ZPD) in the student learning process. This study uses a qualitative approach with the type of Didactic Design Research (DDR). The research stages include analysis of the initial didactic situation to identify student learning barriers, implementation of contextual didactic design in measurement learning, and retrospective analysis of student responses as a basis for reconstructing the didactic design. Data were collected through learning observations, analysis of student work results, interviews, and learning documentation. Data analysis was carried out qualitatively by examining social interaction patterns, forms of scaffolding, and student movements in the Zone of Proximal Development. The results of this study indicate that understanding of measurement concepts develops through social interactions between students and between students and teachers within a meaningful learning context. Social interactions and scaffolding provided gradually can encourage students to move from actual abilities to potential abilities within the Zone of Proximal Development. Retrospective analysis indicates that reconstruction of the didactic design is necessary to refine the learning context, activity sequence, and scaffolding strategies to better align with students' learning characteristics. The reconstruction of the didactic design can reduce learning barriers and improve the quality of students' conceptual understanding in measurement learning. This research provides theoretical contributions to the study of social constructivism-based mathematics education and provides practical implications for teachers in designing measurement learning that is more responsive to social interactions and student learning development.

Social media is one of the most powerful tools brought into new opportunities not only for the marketing sector but also in the political sector for establishing networks within society, sharing information, and making awareness within the communities. SMN provides an exclusive platform for independent discussion for everybody. The former Prime Minister Sheikh Hasina was the head of the state and ruling the country under her power. The country was run consecutively for 3 terms, nearly 16 years without holding a free and fair election. This empirical case study is conducted to examine the power of social media in driving political change in Bangladesh. Secondly, how does the social media networking (SMN) platform impact changing the Gen Z mindset? Thirdly, how the social media tools has been used by the celebrity to mobilize the mass protest to remove the autocrat government in Bangladesh. On the other hand, to evaluate the opposition party like BNP gets benefit from the social media to get enough public strength to remove the autocratic government in Bangladesh. The survey was conducted to collect data through the questionnaire and 495 samples collected from all across Bangladesh. Meanwhile, non-random sampling techniques were also applied to get sample units in this research. The data was analyzed by using the SPSS software to get actual output. The collected all data was summarized to find out the frequency, percentage, correlation between the variables, and mean score of the research. The participant of respondents indicates the social media platform has influence on mass mobilization to change the regime in Bangladesh. The finding of the result shows that Facebook, Messenger, WhatsApp and TikTok are the favorite platforms used during the student movement. The significant of the result shows that social media was playing a vital key role in mobilizing all parties together and shaping the public opinion in one path to remove the Prime Minister of Sheikh Hasina on August 5th 2024.