Publications

Academic Publications

Refereed Journal Articles

Msall, C., Yıldırım, B. F., Özel, S., & Rittle-Johnson, B. (2026). Developing an Understanding of Repeating Patterning. Journal of Numerical Cognition, 12, 1-24. https://doi.org/10.5964/jnc.17029

Ünal, Z. E., Ala, A. M., Kartal, G., Özel, S., & Geary, D. C. (2024). Ninth-Grade Students’ Conceptual Understanding of the Number Line. Journal of Numerical Cognition. https://doi.org/10.5964/jnc.12501

Ünal, Z. E., Ala, A. M., Kartal, G., Özel, S., & Geary, D. C. (2023). Visual and symbolic representations as components of algebraic reasoning. Journal of Numerical Cognition, 9(2), 327-345, https://doi.org/10.5964/jnc.11151

Adıgüzel, T., Aşık, G., Bulut, M. A., Kaya, M. H., & Özel, S. (2023). Teaching self-regulation through role modeling in k-12. Frontiers in Education: Teacher Education, 8: 8:1105466, https://doi.org/10.3389/feduc.2023.1105466

Özel, S. (2022). Erken çocuklukta matematik öğreniminde örüntüler [Patterning in Teaching Mathematics in Early Childhood]. Matematik Dünyası, 29(114), 96-100.

Caksen, B., & Özel, S. (2022). Equal sign representations in curriculum and textbooks in middle schools and students’ understanding of equal sign. Scientia Paedagogica Experimentalis, 59(2), 187-222. https://doi.org/10.57028/S59-187-Z1011

Eren, M., & Özel, S. (2022). Barriers of technology integration in mathematics education. Mediterranean Journal for Research in Mathematics Education: An International Journal, 11(1-2), 59-79.

Ünal, Z. E., Powell, S. R., Özel, S., Scofield, J. E., & Geary, D. C. (2021). Mathematics vocabulary predicts eight graders’ mathematics performance in Turkey and the United States. Learning and Individual Differences, 92, 1-21. https://doi.org/10.1016/j.lindif.2021.102061

Özmen, N , Özel, S , & Adıgüzel, T . (2020). A Framework for Stem-Focused Lesson Plans: A Meta-Synthesis Study. Bogazici University Education Journal, 37(STEM Education Special Issue), 123-154. Retrieved from https://dergipark.org.tr/tr/pub/buje/issue/58376/842400

Küçükler, H., Akaygün, S., İmamoğlu, Y., Aslan Tutak, F., & Özel, S. (2019). The effect of sea and the city summer school on gifted and talented middle school students’ attitudes and perceptions towards the sea and the city [Deniz ve kent yaz okulunun özel yetenekli ortaokul öğrencilerinin deniz ve kente yönelik tutum ve algılarına etkisi]. Fen Bilimleri Öğretimi Dergisi, 7(2), 189-223.

Elia, I., Özel, S., Gagatsis, A., Panaoura, A., & Yetkiner-Özel, Z. E. (2016). Students’ mathematical work on absolute value: focusing on conceptions, errors and obstacles. ZDM Mathematics Education, 48(6), 895-907. DOI:10.1007/s11858-016-0780-1

Özel, S., Yetkiner Özel, Z. E., & Cifuentes, L. D. (2014). Effectiveness of an online manipulative tool and students’ technology acceptances. International Journal of Educational Studies in Mathematics, 1(1), 1-15. DOI:10.17278/ijesim.2014.01.001

Matteson, S. M., Zientek, L. R., & Özel, S. (2013). Identifying what in-service teachers want in professional development experiences. Teacher Education and Practice, 26(3), 569-580.

Yetkiner Özel, Z. E., Özel, S., & Thompson, B. (2013). SES-related mathematics achievement gap in Turkey compared to European Union countries. Education and Science, 38(170), 179-193.

Özel, S. (2013). An analysis of in-service teachers’ pedagogical content knowledge of division of fractions. Anthropologist, 16(1-2), 1-5.

Yetkiner Özel, Z. E., & Özel, S. (2013). Mathematics teacher quality: Its distribution and relationship with student achievement in Turkey. Asia Pacific Education Review, 14(2), 231-242. doi: 10.1007/s12564-013-9242-4

Zientek, L. R., Yetkiner Özel, Z. E., Özel, S., & Allen, J. (2012). Reporting confidence intervals and effect sizes: Collecting the evidence. Career and Technical Education Research, 37(3), 277-295. doi: 10.5328/cter37.3.277

Ölmez, İ. B., & Özel, S. (2012). Mathematics anxiety among sixth and seventh grade Turkish elementary school students. Procedia – Social and Behavioral Sciences, 46, 4933-4937. Doi: https://doi.org/10.1016/j.sbspro.2012.06.362

Özel, S. (2012). Learning rational numbers: An experimental multi-modal representation approach via technology. Mediterranean Journal for Research in Mathematics Education: An International Journal, 11(1-2), 59-79.

Başol, B., Özel, S., & Özel-Yetkiner, Z. E. (2012). The relationship between reading comprehension competence and word problem comprehension among third-grade students. Journal of European Education, 1(1), 1-8.

Capraro, R. M., Capraro, M. M., Yetkiner, Z. E., Corlu, M. S., Özel, S., Ye, S., & Kim, H. G. (2011). An international perspective on students’ understanding of the equal sign. Mediterranean Journal for Research in Mathematics Education: An International Journal, 10, 185-211.

Capraro, R. M., Capraro, M. M., Yetkiner, Z. E., Özel, S., Kim, H. G., & Küçük, A. R. (2010). An international comparison of Grade 6 students’ understanding of the equal sign. Psychological Reports, 106, 49-53. Doi: https://doi.org/10.2466/pr0.106.1.49-53

Özel, S., Yetkiner, Z. E., & Capraro, R. M. (2008). Technology in k-12 mathematics classrooms. School Science and Mathematics, 108, 80-85. Doi: https://doi.org/10.1111/j.1949-8594.2008.tb17807.x

Cifuentes, L., & Özel, S. (2006). Resources for attending to the needs of multicultural learners. Knowledge Quest, 35(2), 12-19.

Erktin, E., Donmez, G., & Özel, S. (2006). Psychometric characteristics of the math anxiety scale. Education and Science, 31(140), 26-33.

Book Chapters

Özel, S., & Babür, N. (2021). Hayat Boyu Öğrenme ve Okuryazarlıklar [Life-Long Learning and Literacies]. In M. Sarıtepeci & H. Yıldız Durak (Eds.). Dijital Çağda Hayat Boyu Öğrenme [Life-Long Learning in Digital Era] (pp. 151-184). Türkiye: Pegem Akademi

Özel, S. (2016). Ölçme, Birim, Nitelik [Measurement, Unit, Characteristics]. In A. N. Elçi, E. Bukova Güzel, B. Cantürk Günhan, & E. Ev Çimen (Eds.), Temel Matematiksel Kavramlar Ve Uygulamaları: Öğrenenler ve Öğretenler İçin [Basic Mathematics Concepts and Their Applications: For Learners and Educators] (pp. 231-236). Türkiye: Pegem Akademi

Olgun, B., & Özel, S. (2016). Olasılık [Probability]. In A. N. Elçi, E. Bukova Güzel, B. Cantürk Günhan, & E. Ev Çimen (Eds.), Temel Matematiksel Kavramlar Ve Uygulamaları: Öğrenenler ve Öğretenler İçin [Basic Mathematics Concepts and Their Applications: For Learners and Educators] (pp. 279-296). Türkiye: Pegem Akademi

Memiş, R., Özel S., & Özcan, M. (2014). Mathematics teachers’ attitudes towards the integration of technology into mathematics classes. In H. Arslan, G. Rata, E. Kocayörük, & M. A. İçbay (Eds.), Multidisciplinary Perspectives on Education (pp. 145-152). New Castle, UK: Cambridge Scholars.

Özel, S., & Yetkiner-Özel, Z. E. (2013). Etkileşimli beyaz tahtalar [Interactive white boards]. In M. Doğan & E. Karakırık (Eds.), Matematik Eğitiminde Teknoloji Kullanımı [Techonology Use in Mathematics Education] (pp. 377-386). Türkiye: Nobel/Atlas.

Özel, S. (2012). Utilizing cognitive resources in user interface designs. In B. Khan (Ed.), User interface design for virtual environments: Challenges and advances (pp. 115-123). Hershey, PA: IGI Global. Doi: https://doi.org/10.4018/978-1-61350-516-8.ch007

Özel, S., & Özel Yetkiner, Z. E (2011). Digital book readers. In S. J. Greenwald & J. E. Thomley (Eds.), Encyclopedia of mathematics and society (pp. 303-304). Pasadena, CA: Salem Press.

Özel, S., & Özel Yetkiner, Z. E (2011). Representations in society. In S. J. Greenwald & J. E. Thomley (Eds.), Encyclopedia of mathematics and society (pp. 863-868). Pasadena, CA: Salem Press.

Özel Yetkiner, Z. E, & Özel, S. (2011). Communication in society. In S. J. Greenwald & J. E. Thomley (Eds.), Encyclopedia of mathematics and society (pp. 219-225). Pasadena, CA: Salem Press.

Özel Yetkiner, Z. E, & Özel, S. (2011). Measurement in society. In S. J. Greenwald & J. E. Thomley (Eds.), Encyclopedia of mathematics and society (pp. 640-645). Pasadena, CA: Salem Press.

Yetkiner, Z. E, & Özel, S. (2010). One-tailed test. In N. J. Salkind (Ed.), Encyclopedia of research design (969-971).Thousand Oaks, CA: Sage.

Stitt, J. R., & Özel, S. (2010). Intorduction to Geographical Information Systems (GIS). In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 27-34). Rotterdam, the Netherlands: Sense.

Stitt, J. R., & Özel, S. (2010). Intro to AutoCAD: Say goodbye to winter. In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 43-48). Rotterdam, the Netherlands: Sense.

Stitt, J. R., & Özel, S. (2010). Geographical Information Systems (GIS): Define the world as you see it. In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 127-132). Rotterdam, the Netherlands: Sense.

Stitt, J. R., & Özel, S. (2010). Geographical Information Systems (GIS): Neighborhood project. In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 133-138). Rotterdam, the Netherlands: Sense.

Stitt, J. R., & Özel, S. (2010). Geographical Information Systems (GIS) and the business models. In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 145-153). Rotterdam, the Netherlands: Sense.

Stitt, J. R., & Özel, S. (2010). Is our library floor plan conducive for learning? In R. M. Capraro, M. M. Capraro, J. Morgan, & J. Scheurich (Eds.), A companion to interdisciplinary STEM project-based learning: For teachers by teachers (pp. 155-161). Rotterdam, the Netherlands: Sense.

Özel, S., Yetkiner, Z. E., Capraro, R. M., & Kupcu, A. R. (2009). Young adolescent education in Turkey. In S. B. Mertens, V. Anfara, & K. Roney (Eds.), An international look at educating young adolescent (pp. 1-23). Charlotte, NC: Information Age.

Cifuentes, L., & Özel, S. (2009). Using technologies to support STEM project-based learning. In R. M. Capraro & S. W. Slough (Eds.), Project-based learning: An integrated sciences, technology, engineering, and mathematics (STEM) approach (pp. 67-78). Rotterdam, the Netherlands: Sense.

Özel, S. (2009). W³ of STEM PBL. In R. M. Capraro & S. W. Slough (Eds.), Project-based learning: An integrated sciences, technology, engineering, and mathematics (STEM) approach (pp. 117-134). Rotterdam, the Netherlands: Sense.doi: https://doi.org/10.1007/978-94-6209-143-6_5

Textbooks

Bozkurt, A., Tatar, E., Karakuş, F., Atik, H., Aktümen, M., Savaş Eren, R., Özel, S., Kösa, T., Kabaca, T., Güner, Ö., Yıldız, A., Çekmez, E., Kertil, M., Kol, M., Ünlü, A. A., Kocabaş, A., Oruç, A., Yaylı, B., Karataş, C., … , Alkan, R. (2013). Ortaöğretim Matematik 9. Sınıf: 1. Kitap [Mathematics for Grade 9: Book 1] (A. K. Erbaş, B. Çetinkaya, B. Güven, İ. Karataş, & Z. Çınkır, Eds.). Milli Eğitim Bakanlığı Yayınları [Turkish Ministry of National Education].

Bozkurt, A., Tatar, E., Karakuş, F., Atik, H., Aktümen, M., Savaş Eren, R., Özel, S., Kösa, T., Kabaca, T., Güner, Ö., Yıldız, A., Çekmez, E., Kertil, M., Kol, M., Ünlü, A. A., Kocabaş, A., Oruç, A., Yaylı, B., Karataş, C., … , Alkan, R.1(2013). Ortaöğretim Matematik 9. Sınıf: 2. Kitap [Mathematics for Grade 9: Book 2] (A. K. Erbaş, B. Çetinkaya, B. Güven, İ. Karataş, & Z. Çınkır, Eds.). Milli Eğitim Bakanlığı Yayınları [Turkish Ministry of National Education].

Bozkurt, A., Tatar, E., Karakuş, F., Atik, H., Aktümen, M., Savaş Eren, R., Özel, S., Kösa, T., Kabaca, T., Güner, Ö., Yıldız, A., Çekmez, E., Kertil, M., Kol, M., Ünlü, A. A., Kocabaş, A., Oruç, A., Yaylı, B., Karataş, C., … , Alkan, R.1(2013). Ortaöğretim Matematik 9. Sınıf: 3. Kitap [Mathematics for Grade 9: Book 3] (A. K. Erbaş, B. Çetinkaya, B. Güven, İ. Karataş, & Z. Çınkır, Eds.). Milli Eğitim Bakanlığı Yayınları [Turkish Ministry of National Education].

Proceedings

Corlu, M. S., Kurutas, B. S., & Ozel, S. (2023). Effective Online Professional Development: A Facilitator's Perspective. In M. Ludwig, S. Barlovits, A. Caldeira, & A. Moura (Eds.), Research on STEM Education in the Digital Age. Proceedings of the ROSEDA Conference (pp.9 23). WTM. https://doi.org/10.37626/GA9783959872522.0.02

Özel, S., & Yetkiner, Z. E. (2010). Multiple representation perspective and students’ acceptance of an online manipulative tool. In J. Sanchez & K. Zhang (Eds.), Proceedings of E-Learn 2010 (2671-2680). Chesapeake, VA: Association for the Advancement of Computing in Education.

Adiguzel, T., Zellner, R., & Özel, S. (2006). Revolutionizing reusable adaptive learning objects: Software for cross-platform development and delivery. In E. Pearson & P. Bohman (Eds.), Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications 2006 (pp. 2048-2053). Chesapeake, VA: Association for the Advancement of Computing in Education.

Translations

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2020). Elementary and middle school mathematics: Teaching developmentally (S. Özel & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing whole-number place-value concepts (211-237), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, 10^th edition, pp. 211-237, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2019, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2020). Elementary and middle school mathematics: Teaching developmentally (S. Özel, Y. Dede, & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing strategies for addition and subtraction computation (238-272), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, 10^th edition, pp. 238-272, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2019, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2020). Elementary and middle school mathematics: Teaching developmentally (Y. Dede, S. Özel, & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing strategies for multiplication and division computation (273-298), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, 10^th edition, pp. 273-298, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2019, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2020). Elementary and middle school mathematics: Teaching developmentally (B. S. Kurutas, S. Özel, & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing fraction concepts (337-372), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, 10^th edition, pp. 337-372, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2019, Boston, MA: Pearson)

Burton, D. M. (2018). The history of mathematics: An introduction (C. Güneş & S. Özel, Trans.). In S. Durmuş (Ed.), Renaissance of Mathematics: Cardan and Tartaglia (301-336), Ankara, Turkey: Nobel Akademik. (Reprinted from The history of mathematics: An introduction, pp. 301-336, by D. M. Burton, 2011, Columbus, OH: McGraw Hill)

Nitko, A. J., & Bookhart, S. M. (2016). Educational assessment of students (B. Bıçak & S. Özel, Trans.). In B. Bıçak, M. Bahar, & S. Özel (Eds.), Validity of Assessment Results (34-62), Ankara, Turkey: Nobel Akademik. (Reprinted from Educational assessment of students, pp. 34-62, by A. J. Nitko, & S. M. Bookhart, 2011, Boston, MA: Allyn & Bacon)

Nitko, A. J., & Bookhart, S. M. (2016). Educational assessment of students (S. Özel, Trans.). In B. Bıçak, M. Bahar, & S. Özel (Eds.), Planning for Integrating Assessment and Instruction (105-129), Ankara, Turkey: Nobel Akademik. (Reprinted from Educational assessment of students, pp. 105-129, by A. J. Nitko, & S. M. Bookhart, 2011, Boston, MA: Allyn & Bacon)

Nitko, A. J., & Bookhart, S. M. (2016). Educational assessment of students (S. Özel, Trans.). In B. Bıçak, M. Bahar, & S. Özel (Eds.), Diagnostic and Formative Assessments (130-149), Ankara, Turkey: Nobel Akademik. (Reprinted from Educational assessment of students, pp. 130-149, by A. J. Nitko, & S. M. Bookhart, 2011, Boston, MA: Allyn & Bacon)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2012). Elementary and middle school mathematics: Teaching developmentally (S. Özel & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing strategies for fraction computation (309-327), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, pp. 309-327, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2010, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2012). Elementary and middle school mathematics: Teaching developmentally (S. Özel & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing fraction concepts (286-308), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, pp. 286-308, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2010, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2012). Elementary and middle school mathematics: Teaching developmentally (S. Özel & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing strategies for whole-number computation (213-239), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, pp. 213-239, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2010, Boston, MA: Pearson)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2012). Elementary and middle school mathematics: Teaching developmentally (S. Özel & Z. E. Yetkiner Özel, Trans.). In S. Durmus (Ed.), Developing whole-number place-value concepts (187-212), Ankara, Turkey: Nobel Akademik. (Reprinted from Elementary and middle school mathematics: Teaching developmentally, pp. 187-212, by J. A. Van de Walle, K. S. Karp, & J. M. Bay-Williams, 2010, Boston, MA: Pearson)