Published December 9, 2025 | Version V1
Publication Open

Enhancing Fifth-Grade Students' Creative Thinking Skills through a Problem-Based Learning Scientific Approach

Authors/Creators

  • 1. Department of Mathematics Education, Faculty of Tarbiyah and Teacher Training (FTIK), UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan, Padangsidimpuan, North Sumatra, Indonesia
  • 2. Doctoral Program (Ph.D.), Education Science Study Program, Mathematics Education, State University of Padang, West Sumatra, Indonesia
  • 3. Preprints.org Editor, MDPI (Wuhan) | 2nd Floor & 7th–9th Floors, Fenghuo Technology Building, No. 88 Youkeyuan Road, Wuhan, Hubei 430064, China

Description

This study aims to analyze the implementation of a scientific-approach-based Problem-Based Learning (PBL) model to enhance the creative thinking skills of fifth-grade students in a public elementary school in North Sumatra, Indonesia. The research was motivated by the identified low level of student creative thinking, attributed to the predominant use of teacher-centered, conventional methods. Employing a descriptive qualitative methodology, data were collected through classroom observations, in-depth interviews with teachers and students, and analysis of learning documentation. The findings demonstrate that integrating the scientific approach (observing, questioning, experimenting, associating, and communicating) within the PBL framework significantly strengthened students' creative thinking abilities. Qualitative data revealed increased active participation, with students showing heightened engagement in group discussions and problem-solving tasks. Specifically, students exhibited an improved capacity to identify problems from given scenarios, generate diverse and original ideas for solutions, and communicate their reasoning more systematically. The structured scientific stages encouraged logical, analytical, and creative thought processes. Despite challenges such as time constraints and varying initial student readiness, the model effectively fostered learning independence and enriched the overall learning environment. In conclusion, the scientific-based PBL model proves to be an effective pedagogical strategy for developing elementary students' conceptual understanding and cultivating a reflective, independent, and creative mindset.

Files

Enhancing Fifth-Grade Students' Creative Thinking Skills through a Problem-Based Learning Scientific Approach.pdf

Files (972.0 kB)

Additional details

Identifiers

Other
Identifier

Related works

Is cited by
Publication: Identifier (Other)

Dates

Accepted
2025-12-09
This study aims to analyze the implementation of a scientific-approach-based Problem-Based Learning (PBL) model to enhance the creative thinking skills of fifth-grade students in a public elementary school in North Sumatra, Indonesia. The research was motivated by the identified low level of student creative thinking, attributed to the predominant use of teacher-centered, conventional methods. Employing a descriptive qualitative methodology, data were collected through classroom observations, in-depth interviews with teachers and students, and analysis of learning documentation. The findings demonstrate that integrating the scientific approach (observing, questioning, experimenting, associating, and communicating) within the PBL framework significantly strengthened students' creative thinking abilities. Qualitative data revealed increased active participation, with students showing heightened engagement in group discussions and problem-solving tasks. Specifically, students exhibited an improved capacity to identify problems from given scenarios, generate diverse and original ideas for solutions, and communicate their reasoning more systematically. The structured scientific stages encouraged logical, analytical, and creative thought processes. Despite challenges such as time constraints and varying initial student readiness, the model effectively fostered learning independence and enriched the overall learning environment. In conclusion, the scientific-based PBL model proves to be an effective pedagogical strategy for developing elementary students' conceptual understanding and cultivating a reflective, independent, and creative mindset.

References

  • Afriana, J., Permanasari, A., & Fitriani, A. (2021). Project-based learning integrated with STEM to enhance elementary school students' scientific literacy. Jurnal Pendidikan IPA Indonesia, *10*(2), 159-168. https://doi.org/10.15294/jpii.v10i2.25305 Almazroa, H., & Alotaibi, W. (2023). The impact of problem-based learning on creative thinking skills among science students. International Journal of Science Education, *45*(4), 567-585. https://doi.org/10.1080/09500693.2023.2175678 Amir, A., Adinda, A., Sutan, T., Siregar, T., & Hariyani, N. (2024). Development of Discrete Mathematics Module Based on Discovery Learning for Mathematical Understanding in Higher Education. Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran, dan Pembelajaran, 10(1), 376-391. Ansori, M., & Nurkholis, N. (2022). The effectiveness of scientific approach-based problem-based learning on students' critical and creative thinking skills. Journal of Education and Learning, *16*(1), 112-120. https://doi.org/10.11591/edulearn.v16i1.20433 Ariyani, D., & Hadi, S. (2024). Enhancing elementary students' creative thinking through contextual problem-based learning with a scientific approach. European Journal of Educational Research, *13*(1), 345-357. https://doi.org/10.12973/eu-jer.13.1.345 Cahyani, R., Sari, M., & Pratama, G. (2023). Digital-based scientific approach in PBL: Its effect on creative thinking and learning independence. International Journal of Instruction, *16*(3), 511-528. https://doi.org/10.29333/iji.2023.16328a Chen, J., & Yang, S. (2024). Fostering 21st century skills through integrated PBL and inquiry-based learning in primary education. Journal of Educational Research and Practice, *14*(2), 89-104. https://doi.org/10.5590/JERAP.2024.14.2.06 Cintia, N. I., Kristin, F., & Anugraheni, I. (2018). Penerapan Model Pembelajaran Discovery Learning untuk Meningkatkan Kemampuan Berpikir Kreatif dan Hasil Belajar Siswa [Application of the Discovery Learning Model to Improve Students' Creative Thinking Skills and Learning Outcomes]. Perspektif Ilmu Pendidikan, 32(1), 67–75. https://doi.org/10.21009/pip.321.8 Diputera, A. M., Damanik, S. H., & Wahyuni, V. (2022). Evaluasi Kebijakan Pendidikan Karakter Profil Pelajar Pancasila dalam Kurikulum Prototipe untuk Pendidikan Anak Usia Dini [Evaluation of Pancasila Student Profile Character Education Policy in the Prototype Curriculum for Early Childhood Education] (Vol. 8, Issue 1). Fauziah, M., & Ramdani, A. (2022). The effect of PBL with scientific approach on metacognitive skills and conceptual understanding of elementary students. JPBI (Jurnal Pendidikan Biologi Indonesia), *8*(1), 45-54. https://doi.org/10.22219/jpbi.v8i1.18945 Gulo, Y., & Telambanua, W. A. (2023). Penggunaan Pendekatan Saintifik Terhadap Hasil Belajar Siswa Mata Pelajaran IPS Kelas VIII SMP Negeri 3 Mandrehe Tahun Pelajaran 2022/2023 [The Use of the Scientific Approach on Student Learning Outcomes in Social Studies Subjects for Class VIII SMP Negeri 3 Mandrehe in the 2022/2023 Academic Year]. Jurnal Pendidikan Dan Konseling, 5(4), 628–639. Halim, A. (2021). Pendekatan Saintifik Kurikulum 2013 [The Scientific Approach of the 2013 Curriculum]. JURNAL ILMU PENDIDIKAN ISLAM, 19(2), 219–236. Hasmiati, Jumadi, O., & Rachmawaty. (2018). Penerapan Model Problem Based Learning (PBL) dalam Meningkatkan Kemampuan Berpikir Kreatif dan Hasil Belajar Siswa [Application of the Problem Based Learning (PBL) Model to Improve Students' Creative Thinking Ability and Learning Outcomes]. Husnaini, S. J., & Chen, S. (2023). Effects of guided inquiry-based professional development on elementary teachers' facilitation of PBL. Journal of Science Teacher Education, *34*(5), 487-506. https://doi.org/10.1080/1046560X.2023.2181337 Ikhlas, A. (2020). Pengaruh Penerapan Pendekatan Saintifik Terhadap Hasil Belajar Matematika Siswa Kelas VIII SMP Pada Materi Teorema Phygoras [The Effect of Applying the Scientific Approach on Mathematics Learning Outcomes of Grade VIII Junior High School Students on Pythagorean Theorem Material]. JIP:Jurnal Inovasi Penelitian, 1(7), 1395–1405. Khoiri, A., & Sunarno, W. (2021). The impact of STEM-PBL on students' creative thinking skills and cognitive learning outcomes. Journal of Physics: Conference Series, *1842*(1), 012071. https://doi.org/10.1088/1742-6596/1842/1/012071 Lee, H., & Lee, J. (2024). A meta-analysis of problem-based learning effects on creative and critical thinking in K-12 education. Educational Research Review, *42*, 100585. https://doi.org/10.1016/j.edurev.2024.100585 Lisa, D., Nasution, M., Siregar, T., Harahap, A., Zainuddin, Z., & Amir, A. (2023). Penggunaan Permainan Edukatif: Suit Perkalian dalam Pembelajaran Matematika. CENDEKIA : Jurnal Penelitian Dan Pengkajian Ilmiah, 1(1), 39-46. https://doi.org/10.62335/wh0cpn12 Ningsih, V. A., Syam, M., & Komariyah, L. (2024). Penerapan Model Problem Based Learning dengan Pendekatan Saintifik untuk Meningkatkan Kemampuan Berpikir Kritis Peserta Didik pada Materi Termodinamika [Application of the Problem Based Learning Model with a Scientific Approach to Improve Students' Critical Thinking Skills on Thermodynamics Material]. JURNAL LITERASI PENDIDIKAN FISIKA, 5(2), 96–106. https://doi.org/10.30872/jlpf.v5i2.2723 Nisa, A., & Khusniati, M. (2023). Local wisdom-integrated PBL with scientific approach: Improving creative thinking and environmental care character. Jurnal Pendidikan Sains Indonesia, *11*(1), 78-92. https://doi.org/10.24815/jpsi.v11i1.28745 Nugraha, W. S. (2018). Peningkatan Kemampuan Berpikir Kritis dan Penguasaan Konsep IPA Siswa SD dengan Menggunakan Model Problem Based Learning [Improving Critical Thinking Skills and Mastery of Science Concepts in Elementary School Students Using the Problem Based Learning Model] (Vol. 10, Issue 2). Nugroho, C. B., Fahinu, & Sani, A. (2018). Pengaruh Model Problem Based Learning dengan Pendekatan Saintifik Terhadap Kemampuan Berpikir Kreatif Matematik Ditinjau Dari Self-Efficacy Siswa SMP [The Effect of the Problem Based Learning Model with a Scientific Approach on Mathematical Creative Thinking Ability in terms of Junior High School Students' Self-Efficacy]. Jurnal Pendidikan Matematika, 9(1), 1–12. Pratiwi, S. N., & Atun, S. (2022). The influence of PBL with a scientific approach on creative thinking skills and learning motivation of elementary students. Journal of Education and E-Learning Research, *9*(3), 176-184. https://doi.org/10.20448/journal.509.2022.93.176.184 Qomaruddin, & Sa'diyah, H. (2024). Kajian Teoritis tentang Teknik Analisis Data dalam Penelitian Kualitatif: Perspektif Spradley, Miles dan Huberman [A Theoretical Study on Data Analysis Techniques in Qualitative Research: The Perspectives of Spradley, Miles and Huberman]. Journal of Management, Accounting, and Administration, 1(2), 77–84. https://doi.org/10.52620/jomaa.v1i2.93 Sari, R. P., & Zubaidah, S. (2024). The correlation between scientific reasoning and creative thinking skills in PBL-based science learning. Journal of Baltic Science Education, *23*(1), 134-148. https://doi.org/10.33225/jbse/24.23.134 Siregar, T. (2023). A Penerapan Model Pembelajaran Problem-Based Learning Untuk Meningkatkan Prestasi Belajar Matematika Siswa Di SMA Negeri 1 Sinunukan. COMPETITIVE: Journal of Education, 2(2), 94-102. Siregar, T. (2023). A Penerapan Model Pembelajaran Problem-Based Learning Untuk Meningkatkan Prestasi Belajar Matematika Siswa Di SMA Negeri 1 Sinunukan. COMPETITIVE: Journal of Education, 2(2), 94–102. https://doi.org/10.58355/competitive.v2i2.9 Siregar, T. (2023). Stages of research and development model research and development (R&D). DIROSAT: Journal of Education, Social Sciences & Humanities, 1(4), 142-158. Siregar, T. (2024). Differentiated Instruction from the Perspective of Cognitive Load Theory. Journal of Educational Sciences, 12(1), 45-60. Siregar, T. (2025). A Meta-Analysis of Student Learning Outcomes in Indonesia: STEAM Integration and Mathematical Problem Solving. Preprint. https://doi.org/10.20944/preprints202510,1252,v1. Siregar, T. (2025). An Analysis of Lecturers' Pedagogical Practices: Balancing Higher‐and Lower‐Order Thinking Skills in Higher Education. Preprint. https://doi.org/10.20944/preprints202510,1231,v1. Siregar, T. (2025). Analysis of mathematical literacy skills through the Think-Talk-Write (TTW) model assisted by GeoGebra in terms of students' self-efficacy. Siregar, T. (2025). Application of GeoGebra for teaching mathematics. Preprint. https://doi.org/10.20944/preprints202510,648,v1. Siregar, T. (2025). Application of the Peer Tutoring Method in Enhancing Students' Mathematical Understanding and Learning Motivation. Siregar, T. (2025). Application of the STAD (Student Teams Achievement Divisions) learning model in improving mathematics learning activities and achievements. Available at SSRN 5484426. Siregar, T. (2025). Application of the STAD (Student Teams Achievement Divisions) Learning Model in Improving Mathematics Learning Activities and Achievements. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.5484426 Siregar, T. (2025). Balancing Higher-and Lower-Order Thinking Skills: An Analysis of Lecturers' Pedagogical Practices in Higher Education. Available at SSRN 5590290. Siregar, T. (2025). Classroom action research-based learning innovations: Kemmis and McTaggart models. Siregar, T. (2025). Developing a GeoGebra-based mathematics learning media using the Van Hiele theory approach to enhance students' understanding of maximum and minimum value. Siregar, T. (2025). Development of artificial intelligence (AI)-based mathematics learning media in calculus courses using the GeoGebra application with the PjBL learning model. Available at SSRN 5577752. Siregar, T. (2025). Effectiveness of the Problem-Based Learning Model in Improving Students' Mathematical Communication Skills and Learning Motivation. Siregar, T. (2025). Exploring Integral Calculus to Determine Volumes of Solids Generated by Rotating Simple Curves Using GeoGebra. Siregar, T. (2025). Improvement of mathematics learning outcomes through the implementation of the realistic mathematics education (RME) approach in primary schools. Zenodo. Retrieved from osf. io/f28nz. Siregar, T. (2025). Integrating GeoGebra in mathematics education: Enhancing pedagogical practices among teachers and lecturers. Yerizon, Integrating GeoGebra in Mathematics Education: Enhancing Pedagogical Practices among Teachers and Lecturers (October 16, 2025). Siregar, T. (2025). Literature review: The use of GeoGebra software on mathematical comprehension ability. Preprint. https://doi.org/10.20944/preprints202510,925,v1. Siregar, T. (2025). Practicality and Effectiveness of Online-Based Calculus Learning Materials Assisted by GeoGebra. Siregar, T. (2025). STEAM integration and mathematical problem solving: A meta-analysis of student learning outcomes in Indonesia. Preprint. https://doi.org/10.20944/preprints202510,1219,v1. Siregar, T. (2025). Tensions Between Perceptions and Practices Among Teacher Educators in Implementing Intellectual Virtues Pedagogy. Siregar, T. (2025). THE EFFECT OF THE USE OF THE ANCHORED INSTRUCTION LEARNING MODEL ON THE IMPROVEMENT OF STUDENTS'MATHEMATICAL COMMUNICATION SKILLS AND SELF-CONCEPT. JOURNAL OF MATHEMATICS EDUCATION, 2(4), 1-20. Siregar, T. (2025). The effectiveness of the discovery learning model in enhancing students' mathematical problem-solving skills. Siregar, T. (2025). The effectiveness of using GeoGebra application with problem-based learning model on students' mathematical communication ability. Siregar, T. (2025). The Influence of Learning Interest and Creativity on Mathematics Achievement Among Students in Calculus Courses. Siregar, T. (2025). Virtual reality (VR) based learning media as a support of mathematics learning process for students in schools. Available at SSRN 5577735. Siregar, T. (2025). Strategy to Enhance Early Mathematics Learning in Early Childhood Education (PAUD). Siregar, T. . (2023). PENGARUH MODEL PROBLEM BASED LEARNING BERBANTUAN LKPD DIGITAL TERHADAP KEMAMPUAN PEMECAHAN ASALAH MATEMATIS SISWA PADA MATERI STATISTIKA. Jurnal Pendidikan Educandum, 3(1), 52-86. https://doi.org/10.55656/jpe.v3i1.286 Siregar, T. . (2024). Aplikasi Model Pembelajaran Inkuiri untuk Meningkatkan Kemampuan Berpikir Kreatif Mahasiswa dalam Belajar Matematika. Indonesian Research Journal on Education, 4(1), 82 –. https://doi.org/10.31004/irje.v4i1.425 Siregar, T. . (2024). Penerapan Model Pembelajaran Think Pair Share untuk Meningkatkan Keterampilan Membaca Teks Recount di Kelas X-1 SMAN 1 Padangsidimpuan. Indonesian Research Journal on Education, 4(1), 118 –. https://doi.org/10.31004/irje.v4i1.426 Siregar, T., & Amir, A. (2024). Improving students' mathematical problem-solving skills through the problem-based learning model assisted by Scratch Learning Media. In International Conference on Mathematics and Science Education. https://tinyurl.com/5n99vvsp. Siregar, T., & Amir, A. (2024). The Effect of Realistic Mathematics Education to Overcome Students' Mathematical Misconceptions about Fractions in SDN 327 Sinunukan. Journal of Matematics In Teaching and Learning, 3(1), 243-250. Siregar, T., & Rhamayanti, Y. (2025). Implementasi pengembangan model ADDIE pada dunia pendidikan. Jurnal Hasil Penelitian dan Pengembangan (JHPP), 3(2), 85-100. Siregar, T., Amir, A., Hilda, L., & Nasution, M. (2024). Pengembangan Model Asesmen As Learning untuk Meningkatkan Keterampilan Berpikir Kreatif Berbasis Education for Sustainable Development pada Mahasiswa Tadris Matematika di UIN Syahada Padangsidimpuan. Siregar, T., Ardian, R., & Arisman, A. (2024). STUDI KASUS SMA N 1 SINUNUKAN: IMPLEMENTASI ALGORITMA K-NEAREST NEIGHBOR UNTUK KLASIFIKASI PENERIMA BEASISWA PROGRAM INDONESIA PINTAR (PIP). Jurnal Cermatika, 4(1), 9-25. Siregar, T., Ardian, R., Harahap, S. R., & Nasution, A. A. (2023). MEDIA PEMBELAJARAN BERBASIS ICT MENGGUNAKAN SOFTWARE SCRATCHPADA MATERI PELUANG DI SMPN 2 PORTIBI. SINERGI : Jurnal Riset Ilmiah, 1(1), 6-14. https://doi.org/10.62335/b6a7cf11 Siregar, T., dkk (2024). Penerapan Problem Based Learning Untuk Meningkatkan Motivasi dan Hasil Belajar Siswa Pada Materi Vektor. Cigarskruie: Jurnal Pendidikan & Studi Islam. Hlm, 99-130 . Vol. 1, No. 2, 2024. Siregar, T., Fauzan, A., Yerizon, Y., & Syafriandi, S. (2025). Designing Mathematics Teaching through Deep Learning Pedagogy: Toward Meaningful, Mindful, and Joyful Learning. Journal of Deep Learning, 188-202. Siregar, T., Harahap, A., Arisman, A., Rangkuti, H. H., Harahap, I. S., Ardian, R., ... & Batubara, Z. (2023). What Makes it Special?: Content Knowledge for Teaching. International Journal of Applied, 1(1), 21-40. Siregar, T., Hilda, L., Amir, A., Syekh, U., & Hasan, A. (2024). Evaluasi dalam Meningkatkan Kemampuan Pemecahan Masalah Matematika Mahasiswa melalui Penggunaan Metode Tugas Berbasis Proyek di UIN Syahada Padangsidimpuan Evaluasi dalam Meningkatkan Kemampuan Pemecahan Masalah Matematika Mahasiswa melalui Penggunaan Met. Siregar, T., Sugiman, S., Jailani, J., Adinda, A., & Amir, A. (2025). Implementasi Pendekatan Kontekstual Untuk Meningkatkan Prestasi Belajar Matematika Siswa Kelas V SDN 327 Sinunukan. Dedikasi : Jurnal Pengabdian Kepada Masyarakat, 4(1), 1–14. https://doi.org/10.53276/dedikasi.v4i1.207 Siregar, T., Zuhair, R. A., Iskandarsyah, S. S., & Amir, A. (2023). Pengaruh Minat dan Kreativitas Belajar terhadap Prestasi Matematika Mahasiswa pada Mata Kuliah Kalkulus. Journal of Matematics In Teaching and Learning, 1(2), 32-42. Siregar, Torang, The Effects of GeoGebra on Students Achievement (October 08, 2025). Available at SSRN: https://ssrn.com/abstract=5577731 or http://dx.doi.org/10.2139/ssrn.5577731 Siregar, Torang. "Application of Problem Based Learning to Improve Student Motivation and Learning Outcomes on Vector Material." Cigarskruie: Journal of Educational and Islamic Research, vol. 1, no. 2, Mar. 2024, pp. 99-130, doi:10.65190/636423 Suryanti, S., & Arifin, I. (2023). Differentiated PBL with scientific approach: An alternative for enhancing creative thinking in inclusive classrooms. International Journal of Learning, Teaching and Educational Research, *22*(4), 1-18. https://doi.org/10.26803/ijlter.22.4.1 Susanto, S. (2020). Efektifitas Small Group Discussion dengan Model Problem Based Learning dalam Pembelajaran di Masa Pandemi Covid-19 [The Effectiveness of Small Group Discussion with the Problem Based Learning Model in Learning during the Covid-19 Pandemic]. Torang Siregar, & Almira Amir. (2024). Efforts to Increase Mathematics Learning Activities and Achievements Through the Application of Game Methods in Class VI of SD Negeri 327 Sinunukan, Sinunukan District. COMPETITIVE: Journal of Education, 3(1), 28–44. https://doi.org/10.58355/competitive.v3i1.48 Torang Siregar, Ahmad Arisman, Iskandarsyah, Risky Ardian, & Awal Harahap. (2023). Research And Developing Mathematics Knowledge Child Development Perspectives, 2022. Elementaria: Journal of Educational Research, 1(2), 65–76. https://doi.org/10.61166/elm.v1i2.11 Torang Siregar, Almira Amir, Lelya Hilda, Suparni, & Anita Adinda. (2023). Determining the Surface Area of a Tube Using the Discovery Learning Model at SMP Negeri 5 Sinunukan. COMPETITIVE: Journal of Education, 2(4), 265–275. https://doi.org/10.58355/competitive.v2i4.44 Torang Siregar, Marsigit, Atmini, R Rosnawati, & Karyati. (2024). UPAYA MEREDUKSI PERILAKU BULLYING MELALUI BIMBINGAN KELOMPOK DENGAN TEKNIK ROLE PLAYING PADA SISWA MTS NEGERI 1 PADANGSIDIMPUAN. Jurnal Pendekar Nusantara, 1(3). https://doi.org/10.37776/pend.v1i3.1349 Waruwu, M. (2024). Pendekatan Penelitian Kualitatif: Konsep, Prosedur, Kelebihan dan Peran di Bidang Pendidikan [Qualitative Research Approach: Concepts, Procedures, Strengths and Roles in Education]. https://afeksi.id/jurnal/index.php/afeksi/ Wulandari, F., & Yogica, R. (2024). Development of PBL e-modules with scientific approach to train creative thinking skills of elementary students. Jurnal Ilmiah Sekolah Dasar, *8*(1), 1-10. https://doi.org/10.23887/jisd.v8i1.65432 Yunanti, I. A., & Regina, B. D. (2023). Penerapan Model Problem Based Learning (PBL) Melalui Pendekatan Saintifik untuk Meningkatkan Hasil Belajar IPS Materi Pemenuhan Kebutuhan Kelas IV SDN 1 Gemaharjo Kabupaten Tranggalek [Application of the Problem Based Learning (PBL) Model Through a Scientific Approach to Improve Social Studies Learning Outcomes on Needs Fulfillment Material for Grade IV SDN 1 Gemaharjo, Tranggalek Regency]. Pendas: Jurnal Ilmiah Pendidikan Dasar, 08(01), 5928–5936. Yuniarti, A., Titin, Safarini, F., Rahmadia, I., & Putri, S. (2023). Media Konvensional dan Media Digital Dalam Pembelajaran [Conventional Media and Digital Media in Learning] (Vol. 4, Issue 2).