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Teachers' pedagogical ability contributes significantly to their process and learning performance. To improve it, a development process is needed as long as they are still having their process of education or they are still teacher students. This study aimed to develop a valid and practical PMRI learning environment through lesson study which had a potential effect on improving the pedagogical abilities of pre-service primary school teachers. A design research method of development study type was used in this study consisting of three phases, namely the preliminary, development or prototyping phase, and assessment phase. The research subjects were 32 students of Primary School Teacher Education of Sriwijaya University. The data were collected using walkthrough, observation, documentation, questionnaires, interviews, and tests. The study produced a learning environment with a valid and practical Campus-School (CS) model and had a potential effect on improving teacher students' pedagogical ability. The learning environment was in the form of training on campus and implementation in schools. Based on the data analysis, the learning environment was able to produce pre-service primary education teachers understanding the PMRI through lesson study and design PMRI learning tools through a lesson study. AbstrakKemampuan pedagogik guru memiliki kontribusi yang signifikan dalam proses dan kinerja pembelajaran. Untuk meningkatkannya, proses pengembangan diperlukan sepanjang guru tersebut masih menjalani proses pendidikannya atau masih berstatus calon guru. Penelitian ini bertujuan mengembangkan lingkungan belajar PMRI dengan lesson study yang valid dan praktis serta memiliki efek potensial untuk meningkatkan kemampuan pedagogis mahasiswa calon guru sekolah dasar. Penelitian menggunakan metode design research tipe development studies. Penelitian ini terdiri dari tiga tahap, yaitu tahap preliminary, development or prototyping phase dan assesment phase. Subjek penelitian adalah 32 orang mahasiswa Pendidikan Guru Sekolah Dasar Universitas Sriwijaya. Pengumpulan data dilakukan dengan cara walkthrough, observasi, dokumentasi, angket, wawancara dan tes. Penelitian menghasilkan lingkungan belajar dengan model Kampus-Sekolah (KS) yang valid dan praktis serta memiliki efek potensial dalam meningkatkan kemampuan pedagogis mahasiswa. Lingkungan belajar tersebut berupa pelatihan di kampus dan implementasi di sekolah. Berdasarkan analisis data, lingkungan belajar mampu menghasikan calon guru yang memahami PMRI melalui lesson study serta mampu mendesain perangkat pembelajaran PMRI melalui lesson study.

TOEFL as a kind of English test is used to measure students’ language proficiency. Binawan University applies TOEFL Prediction test to predict students’ English competence. The TOEFL score then is aligned and mapped to CEFR to indicate the level of language ability and qualification.    This study was conducted to analyze TOEFL score of Binawan students at CEFR level. The sample was 169 students from several study programs at Binawan University. The research instrument used a package of PBT TOEFL test. Descriptive statistics was used as data analysis technique, mean and percentage. The calculation shows that the mean of the TOEFL prediction score reached by all participants is 413 and the median is 397. Based on CEFR, the students’ competence in English is in level A2 (Basic User). Individually, the number of students who is in level A1 (Basic User) is 78 or 46.2 %, level A2 (Basic User) is 35 or 20.7 %, level B1 (Independent User) is 43 or 25.4 %, level B2 (independent User) is 12 or 7.1 %, and the last is level C1 which is occupied by 1 student only that is in level C1 (0.6 %). To conclude almost 50 % of the students were at low level or A2 (Basic User) at CEFR.

This study focuses on the process of English words which are loaned or borrowed into Indonesian language and are used on Indonesian health articles in online news pages such as detik.com, kompas.com and viva.com. The data are analyzed based on the four word forms namely noun, verb, adjective and adverb. Besides, they are also analyzed based on either the morphological process or phonological process. The study applies the descriptive qualitative method applying the content analysis technique. The findings of the research show that there are 606 loan words. Based on word form category there are 425 words (70.13 %) as noun, adjective with 96 words (15.84%), verb with 82 words (13.50%) adverb with only 3 words (0.49%). For morphological process, it can be categorized in some various processes, they are affixation with several prefixes and suffixes. In addition, there are some words with reduplication as many as 7 words (6.14%) and abbrevation process, they are 13 words (11.40%). Phonological process occurs into several parts, they are adoption, translation and adaptation. For adoption, there are 395 words (65.18%), adaptation with 166 words (27.39%) and translation with 45 words (7.42%).

This study aims to produce Student Worksheets 1 and 2 that use the Indonesian Realistic Mathematics Education approach on the material of surface area of ​​the beam that is valid, practical and has a potential effect on the teaching and learning process in the classroom. This study uses a design research method of development studies at the preliminary analysis and formative evaluation stages. In addition, lesson study is also used as a system used during design and implementation in the classroom. The research subjects were 25 students of the Palembang IBA Foundation Elementary School. The results showed that Student Worksheets 1 and 2 which had been designed using the context of wrapping paper were valid, practical and had a potential effect on the learning process in the classroom. In conclusion, the use of Indonesian Realistic Mathematics Education and lesson study at the time of implementation in the form of Student Worksheets with the context of wrapping paper in the classroom has helped students understand the concept of surface area of ​​a block, be able to solve problems and make learning more meaningful.   Keywords: PMRI, Design Research, Lesson Study