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Academic Communities of Engagement: an expansive lens for examining support structures in blended and online learning

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Abstract

In this article we share the Academic Communities of Engagement (ACE) framework, which describes a student’s ability to engage affectively, behaviorally, and cognitively in an online or blended course independently and with support. Based on Vygotsky’s (Mind in society: the development of higher psychological processes, Harvard University Press, Cambridge, 1978) zone of proximal development, the framework examines how a student’s ability to engage in online or blended courses increases with support from two types of communities. The course community is organized and facilitated by those associated with the course or program. The personal community is comprised of actors not officially associated with the course who have typically formed relationships with the student before the course or program began and may extend well beyond its boundaries. Actors within each community have varying skills and abilities to support student engagement, and a student is most likely to reach the necessary engagement for academic success with active support from both. The framework identifies the community actors most likely to provide specific support elements, aligning them to the different types of student engagement. The article outlines implications for practice and research, concluding with illustrative examples.

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Adapted from Halverson and Graham 2019, p. 147

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References

  • Anderson, T., Rourke, L., Garrison, D. R., & Archer, W. (2001). Assessing teaching presence in a computer conferencing context. Journal of Asynchronous Learning Networks,5(2), 1–17.

    Google Scholar 

  • Archer, W. (2010). Beyond online discussions: Extending the community of inquiry framework to entire courses. The Internet and Higher Education,13(1–2), 69. https://doi.org/10.1016/j.iheduc.2009.10.005.

    Article  Google Scholar 

  • Arizona State University Online. (2017). ASU Online launches success center. Retrieved February 10, 2020, from https://asuonline.asu.edu/newsroom/online-learning-tips/asu-online-launches-success-center/.

  • Bandura, A. (1986). Social foundations of thought and action. Englewood Cliffs, NJ: Prentice-Hall Inc.

    Google Scholar 

  • Ben-Eliyahu, A., Moore, D., Dorph, R., & Schunn, C. D. (2018). Investigating the multidimensionality of engagement: Affective, behavioral, and cognitive engagement across science activities and contexts. Contemporary Educational Psychology,53(1), 87–105. https://doi.org/10.1016/j.cedpsych.2018.01.002.

    Article  Google Scholar 

  • Borup, J. (2016a). Teacher perceptions of parent engagement at a cyber high school. Journal of Research on Technology in Education. https://doi.org/10.1080/15391523.2016.1146560.

    Article  Google Scholar 

  • Borup, J. (2016b). Teacher perceptions of learner-learner engagement at a cyber high school. International Review of Research in Open and Distance Learning. https://doi.org/10.19173/irrodl.v17i3.2361.

    Article  Google Scholar 

  • Borup, J. (2018). On-site and online facilitators: Current and future direction for research. In K. Kennedy & R. Ferdig (Eds.), Handbook of research on K-12 online and blended learning (2nd ed., pp. 423–442). Halifax: ETC Press.

    Google Scholar 

  • Borup, J., Chambers, C., & Stimson, R. (2019a). K-12 student perceptions of online teacher and on-site facilitator support in supplemental online courses. Online Learning,23(4), 253–280.

    Article  Google Scholar 

  • Borup, J., Chambers, C., & Stimson, R. (2019b). Online teacher and on-site facilitator perceptions of parental engagement at a supplemental virtual high school. International Review of Research in Open and Distributed Learning. https://doi.org/10.19173/irrodl.v20i2.4237.

    Article  Google Scholar 

  • Borup, J., Graham, C. R., & Drysdale, J. S. (2014a). The nature of teacher engagement at an online high school. British Journal of Educational Technology. https://doi.org/10.1111/bjet.12089.

    Article  Google Scholar 

  • Borup, J., & Stevens, M. (2016). Parents’ perceptions of teacher support at a cyber charter high school. Journal of Online Learning Research.,2, 227–246.

    Google Scholar 

  • Borup, J., & Stevens, M. A. (2017). Using student voice to examine teacher practices at a cyber charter high school. British Journal of Educational Technology. https://doi.org/10.1111/bjet.12541.

    Article  Google Scholar 

  • Borup, J., Stevens, M. A., & Hasler-Waters, L. (2015). Parent and student perceptions of parent engagement at a cyber charter high school. Journal of Asynchronous Learning Network,19(5), 69–91.

    Google Scholar 

  • Borup, J., & Stimson, R. (2019). Online teachers’ and on-site facilitators’ shared responsibilities at a supplemental virtual secondary school. American Journal of Distance Education,33(1), 29–45.

    Article  Google Scholar 

  • Borup, J., West, R. E., Graham, C. R., & Davies, R. S. (2014b). The Adolescent Community of Engagement: A framework for research on adolescent online learning. Journal of Technology and Teacher Education,22(1), 107–129.

    Google Scholar 

  • Cho, V., & Littenberg-Tobias, J. (2016). Digital devices and teaching the whole student: Developing and validating an instrument to measure educators’ attitudes and beliefs. Educational Technology Research and Development,64(4), 643–659. https://doi.org/10.1007/s11423-016-9441-x.

    Article  Google Scholar 

  • Christenson, S. L., Reschly, A. L., & Wylie, C. (2012). Handbook of research on student engagement. New York, NY: Springer.

    Book  Google Scholar 

  • de la Varre, C., Irvin, M. J., Jordan, A. W., Hannum, W. H., & Farmer, T. W. (2014). Reasons for student dropout in an online course in a rural K-12 setting. Distance Education,35(3), 324–344. https://doi.org/10.1080/01587919.2015.955259.

    Article  Google Scholar 

  • Drysdale, J. S., Graham, C. R., & Borup, J. (2014). An online high school “shepherding” program: Teacher roles and experiences mentoring online students. Journal of Technology & Teacher Education, 22(1), 9–32.

    Google Scholar 

  • Dziuban, C., Graham, C. R., Moskal, P. D., Norberg, A., & Sicilia, N. (2018). Blended learning: The new normal and emerging technologies. International Journal of Educational Technology in Higher Education, 15, 3. https://doi.org/10.1186/s41239-017-0087-5.

    Article  Google Scholar 

  • Faller, M. (2018). ASU helps more students return after freshman year and thrive during college. ASU Now. Retrieved February 10, 2020, from https://asunow.asu.edu/20180828-asu-news-freshman-retention-higher-national-average-thrive.

  • Farrell, E. F. (2007). Some colleges provide success coaches for students: New kind of adviser helps hone life and study skills. The Chronicle of Higher Education, 53(46). https://www.chronicle.com/article/Some-Colleges-Provide-Success/10133.

  • Ferdig, R. E., Cavanaugh, C., DiPietro, M., Black, E., & Dawson, K. (2009). Virtual schooling standards and best practices for teacher education. Journal of Technology and Teacher Education,17(4), 479–503.

    Google Scholar 

  • Filak, V. F., & Sheldon, K. M. (2008). Teacher support, student motivation, student need satisfaction, and college teacher course evaluations: Testing a sequential path model. Educational Psychology,28(6), 711–724. https://doi.org/10.1080/01443410802337794.

    Article  Google Scholar 

  • Fredricks, J. A., Blumenfeld, P. C., & Paris, A. H. (2004). School engagement: Potential of the concept, state of the evidence. Review of Educational Research,74(1), 59–109.

    Article  Google Scholar 

  • Freidhoff, J. R. (2018). Michigan’s k-12 virtual learning effectiveness report: 2016-17. Lansing, MI: Michigan Virtual University. Retrieved February 10, 2020, from https://mvlri.org/research/effectiveness-report/.

  • Garrison, R. (2009). Implications of online learning for the conceptual development and practice of distance education. Journal of Distance Education,23(2), 93–104.

    Google Scholar 

  • Garrison, D. R., Anderson, T., & Archer, W. (2000). Critical inquiry in a text-based environment: Computer conferencing in higher education. The Internet and Higher Education,2(2–3), 87–105. https://doi.org/10.1016/S1096-7516(00)00016-6.

    Article  Google Scholar 

  • Gemin, B., Pape, L., Vashaw, L., & Watson, J. (2016). Keeping pace with K-12 online learning. Evergreen Education. Retrieved February 10, 2020, from https://www.evergreenedgroup.com/keeping-pace-reports.

  • Gill, B., Walsh, L., Wulsin, C. S., Matulewicz, H., Severn, V., Grau, E., …, Kerwin, T. (2015). Inside online charter schools. Cambridge, MA: Walton Family Foundation and Mathematica Policy Research. Retrieved February 10, 2020, from http://www.mathematica-mpr.com/~/media/publications/pdfs/education/inside_online_charter_schools.pdf.

  • Graham, C. R., Henrie, C. R., & Gibbons, A. S. (2014). Developing models and theory for blended learning research. In A. G. Picciano, C. D. Dziuban, & C. R. Graham (Eds.), Blended learning: Research perspectives (Vol. 2, pp. 13–33). New York: Routledge.

    Google Scholar 

  • Halverson, L. R., & Graham, C. R. (2019). Learner engagement in blended learning environments: A conceptual framework. Online Learning.,23(2), 145–178. https://doi.org/10.24059/olj.v23i2.1481.

    Article  Google Scholar 

  • Hannum, W. H., Irvin, M. J., Lei, P., & Farmer, T. W. (2008). Effectiveness of using learner-centered principles on student retention in distance education courses in rural schools. Distance Education,29(3), 211–229. https://doi.org/10.1080/01587910802395763.

    Article  Google Scholar 

  • Harms, C. M., Niederhauser, D. S., Davis, N. E., Roblyer, M. D., & Gilbert, S. B. (2006). Educating educators for virtual schooling: Communicating roles and responsibilities. The Electronic Journal of Communication,16(1 & 2), 17–24.

    Google Scholar 

  • Hasler Waters, L., & Leong, P. (2014). Who is teaching? New roles for teachers and parents in cyber charter schools. Journal of Technology and Teacher Education, 22(1), 33–56.

    Google Scholar 

  • Hendrix, N., & Degner, K. (2016). Supporting online AP students: The rural facilitator and considerations for training. American Journal of Distance Education,30(3), 133–144. https://doi.org/10.1080/08923647.2016.1198194.

    Article  Google Scholar 

  • Henrie, C. R., Halverson, L. R., & Graham, C. R. (2015). Measuring student engagement in technology-mediated learning: A review. Computers & Education, 90, 36–53. https://doi.org/10.1016/j.compedu.2015.09.005.

    Article  Google Scholar 

  • Hillman, D. C., Willis, D. J., & Gunawardena, C. (1994). Learner-interface interaction in distance education: An extension of contemporary models and strategies for practitioners. American Journal of Distance Education,8(2), 30–42.

    Article  Google Scholar 

  • Hollis, R. B., & Was, C. A. (2016). Mind wandering, control failures, and social media distractions in online learning. Learning and Instruction,42, 104–112. https://doi.org/10.1016/j.learninstruc.2016.01.007.

    Article  Google Scholar 

  • Hoover-Dempsey, K. V., Walker, J. M. T., Sandler, H. M., Whetsel, D., Green, C. L., Wilkins, A. S., et al. (2005). Why do parents become involved? Research findings and implications. The Elementary School Journal,106(2), 105–130.

    Article  Google Scholar 

  • Hughes, J. N., Luo, W., Kwok, O.-M., & Loyd, L. K. (2008). Teacher-student support, effortful engagement, and achievement: A 3-year longitudinal study. Journal of Educational Psychology,100(1), 1–14. https://doi.org/10.1037/0022-0663.100.1.1.

    Article  Google Scholar 

  • International Association for K-12 Online Learning (iNACOL). (2011). National standards for quality online courses. Vienna, VA. Retrieved February 10, 2020, from http://www.inacol.org/cms/wp-content/uploads/2013/02/iNACOL_TeachingStandardsv2.pdf.

  • Kuh, G. D., Jankowski, N., Ikenberry, S. O., & Kinzie, J. (2014). Knowing what students know and can do: The current state of student learning outcomes assessment in U.S. colleges and universities. Champaign, IL: National Institute for Learning Outcomes Assessment. Retrieved February 10, 2020, from http://www.learningoutcomeassessment.org/documents/2013%20Abridged%20Survey%20Report%20Final.pdf.

  • Kuh, G. D., Kinzie, J., Buckley, J. A., Bridges, B. K., & Hayek, J. C. (2007). Piecing together the student success puzzle: Research, propositions, and recommendations. ASHE Higher Education Report,32(5), 1–182. https://doi.org/10.1002/aehe.3205.

    Article  Google Scholar 

  • Lehan, T. J., Hussey, H. D., & Shriner, M. (2018). The influence of academic coaching on persistence in online graduate students. Mentoring & Tutoring: Partnership in Learning,26(3), 289–304. https://doi.org/10.1080/13611267.2018.1511949.

    Article  Google Scholar 

  • Lokey-Vega, A., Jorrín-Abellán, I. M., & Pourreau, L. (2018). Theoretical perspectives in K-12 online learning. In K. Kennedy & R. Ferdig (Eds.), Handbook of research on K-12 online and blended learning (2nd ed., pp. 403–422). ETC Press. Retrieved February 10, 2020, from http://press.etc.cmu.edu/index.php/product/handbook-of-research-on-k-12-and-blending-learning-second-edition/.

  • Lowes, S., & Lin, P. (2015). Learning to learn online: Using locus of control to help students become successful online learners. Journal of Online Learning Research,1(1), 17–48.

    Google Scholar 

  • Ludwig-Hardman, S., & Dunlap, J. C. (2003). Learner support services for online students: Scaffolding for success. International Review of Research in Open and Distance Learning. https://doi.org/10.19173/irrodl.v4i1.131.

    Article  Google Scholar 

  • Macfarlane, B., & Tomlinson, M. (2017). Critical and alternative perspectives on student engagement. Higher Education Policy,30(1), 1–4. https://doi.org/10.1057/s41307-016-0026-4.

    Article  Google Scholar 

  • Maitland, C., & Obeysekare, E. (2015). The creation of capital through an ICT-based learning program: A case study of MOOC camp. In Proceedings of the Seventh International Conference on Information and Communication Technologies and Development. Singapore. https://doi.org/10.1145/2737856.2738024.

  • Martin, K. A., Goldwasser, M. M., & Galentino, R. (2017). Impact of cohort bonds on student satisfaction and engagement. Current Issues in Education,19(3), 1–14.

    Google Scholar 

  • McClendon, C., Massey Neugebauer, R., & King, A. (2017). Grit, growth mindset, and deliberate practice in online learning. Journal of Instructional Research,6, 8–17.

    Article  Google Scholar 

  • Merriam, S. B. (1998). Qualitative research and case study applications in education: Revised and expanded from case study research in education. San Francisco, CA: Jossey-Bass.

    Google Scholar 

  • Michinov, N., Brunot, S., Bohec, O. Le, Juhel, J., & Delaval, M. (2011). Procrastination, participation, and performance in online learning environments. Computers & Education,56, 243–252. https://doi.org/10.1016/j.compedu.2010.07.025.

    Article  Google Scholar 

  • Mishra, P., & Koehler, M. J. (2006). Technological pedagogical content knowledge: A framework for teacher knowledge. Teachers College Record,108(6), 1017–1054.

    Article  Google Scholar 

  • Moore, M. G. (1980). Independent study. In R. Boyd & J. Apps (Eds.), Redefining the discipline of adult education (pp. 16–31). San Francisco, CA: Jossey-Bass.

    Google Scholar 

  • Moore, M. G. (1989). Three types of interaction [Editorial]. American Journal of Distance Education,3(2), 1–7. https://doi.org/10.1080/08923648909526659.

    Article  Google Scholar 

  • Mountford-Zimdars, A., Sabri, D., Moore, J., Sanders, J., Jones, S., & Higham, L. (2015). Causes of differences in student outcomes [White paper]. Retrieved February 10, 2020, from King’s College London: http://dera.ioe.ac.uk/23653/1/HEFCE2015_diffout.pdf.

  • Noddings, N. (1984). Caring: A feminine approach to ethics and moral education. Berkeley, CA: University of California Press.

    Google Scholar 

  • Oldfield, J., Rodwell, J., Curry, L., & Marks, G. (2019). A face in a sea of faces: Exploring university students’ reasons for non-attendance to teaching sessions. Journal of Further and Higher Education,43(4), 443–452. https://doi.org/10.1080/0309877X.2017.1363387.

    Article  Google Scholar 

  • Oviatt, D., Graham, C. R., Borup, J., & Davies, R. S. (2016). Online student perceptions of the need for a proximate community of engagement at an independent study program. Journal of Online Learning Research,2(4), 333–365.

    Google Scholar 

  • Oviatt, D. R., Graham, C. R., Davies, R. S., & Borup, J. (2018). Online student use of a proximate community of engagement in an independent study program. Online Learning,22(1), 223–251.

    Article  Google Scholar 

  • Repetto, J., Cavanaugh, C., Wayer, N., & Liu, F. (2010). Virtual high schools: Improving outcomes for students with disabilities. Quarterly Review of Distance Education,11(2), 91–104.

    Google Scholar 

  • Reschly, A. L., & Christenson, S. L. (2012). Jingle, jangle, and conceptual haziness: Evolution and future directions of the engagement construct. In S. L. Christenson, A. L. Reschly, & C. Wylie (Eds.), Handbook of research on student engagement (pp. 3–19). New York: Springer.

    Chapter  Google Scholar 

  • Roblyer, M. D., Freeman, J., Stabler, M., & Schneidmiler, J. (2007). External evaluation of the Alabama ACCESS initiative phase 3 report. Eugene, OR: International Society for Technology in Education. Retrieved February 10, 2020, from http://accessdl.state.al.us/2006Evaluation.pdf.

  • Roksa, J., & Kinsley, P. (2018). The role of family support in facilitating academic success of low-income students. Research in Higher Education,60(4), 415–436. https://doi.org/10.1007/s11162-018-9517-z.

    Article  Google Scholar 

  • Roorda, D. L., Koomen, H. M. Y., Split, J. L., & Oort, F. J. (2011). The influence of affective teacher-student relationships on students’ school engagement and achievement: A meta-analytic approach. Review of Educational Research,81(4), 493–529. https://doi.org/10.3102/0034654311421793.

    Article  Google Scholar 

  • Rose, R. M., Smith, A., Johnson, K., & Glick, D. (2015). Ensuring equitable access in online and blended learning. In T. Clark & M. K. Barbour (Eds.), Online, blended, and distance education in schools: Building successful programs (pp. 71–83). Sterling, VA: Stylus Publishing.

    Google Scholar 

  • Rovai, A. P. (2003). In search of higher persistence rates in distance education online programs. Internet and Higher Education,6, 1–16.

    Article  Google Scholar 

  • Seaman, J. E., Allen, I. E., & Seaman, J. (2018). Grade increase: Tracking distance education in the United States. Babson Survey Research Group. Retrieved February 10, 2020, from https://eric.ed.gov/?id=ED580852.

  • Shephard, K. (2008). Higher education for sustainability: Seeking affective learning outcomes. International Journal of Sustainability in Higher Education,9(1), 87–98. https://doi.org/10.1108/14676370810842201.

    Article  Google Scholar 

  • Skinner, E., Furrer, C., Marchand, G., & Kindermann, T. (2008). Engagement and disaffection in the classroom: Part of a larger motivational dynamic? Journal of Educational Psychology,100(4), 765–781. https://doi.org/10.1037/a0012840.

    Article  Google Scholar 

  • Skinner, E. A., & Pitzer, J. R. (2012). Developmental dynamics of student engagement, coping, and everyday resilience. In S. L. Christenson, A. L. Reschly, & C. Wylie (Eds.), Handbook of research on student engagement (pp. 21–44). Boston, MA: Springer. https://doi.org/10.1007/978-1-4614-2018-7_2.

    Chapter  Google Scholar 

  • Skinner, E. A., Wellborn, J. G., & Connell, J. P. (1990). What it takes to do well in school and whether I’ve got it: A process model of perceived control and children’s engagement and achievement in school. Journal of Educational Psychology,82(1), 22–32. https://doi.org/10.1037//0022-0663.82.1.22.

    Article  Google Scholar 

  • Spring, K. J. K. (2018). Academic Communities of Engagement and Their Influence on Student Engagement (Unpublished doctoral dissertation). Provo, Utah: Brigham Young University.

    Google Scholar 

  • Stake, R. E. (2010). Qualitative research: Studying how things work. New York: Guilford Press.

    Google Scholar 

  • Su, J., & Waugh, M. L. (2018). Online student persistence or attrition: Observations related to expectations, preferences, and outcomes. Journal of Interactive Online Learning,16(1), 63–79.

    Google Scholar 

  • Symeonides, R., & Childs, C. (2015). The personal experience of online learning: An interpretative phenomenological analysis. Computers in Human Behavior,51, 539–545. https://doi.org/10.1016/j.chb.2015.05.015.

    Article  Google Scholar 

  • Taylor, S., Clements, P., Heppen, J., Rickles, J., Sorensen, N., Walters, K., …, Micheiman, V. (2016). Getting back on track: The role of in-person instructional support for students taking online credit recovery (Research Brief 2). Washington, DC: American Institutes for Research. Retrieved February 10, 2020, from https://www.air.org/system/files/downloads/report/In-Person-Support-Credit-Recovery.pdf.

  • Trowler, V. (2010). Student engagement literature review [White Paper]. Retrieved February 10, 2020, from The Higher Education Academy: http://scholar.google.com/scholar_url?url=https://pdfs.semanticscholar.org/6d0c/5f9444fc4e92cca76fe9f426bd107e837a9f.pdf&hl=en&sa=X&scisig=AAGBfm3WmhAV9GCJ8rx8hzFi9SZoBMiOYw&nossl=1&oi=scholarr.

  • Tze, V. M. C., Daniels, L. M., & Klassen, R. M. (2016). Evaluating the relationship between boredom and academic outcomes: A meta-analysis. Educational Psychology Review,28, 119–144. https://doi.org/10.1007/s10648-015-9301-y.

    Article  Google Scholar 

  • Vygotsky, L. S. (1978). Mind in society: The development of higher psychological processes (M. Cole, Ed.). Cambridge, MA: Harvard University Press.

  • Watson, J., Murin, A., Vashaw, L., Gemin, B., & Rapp, C. (2012). Keeping pace with K-12 online and blended Learning: An annual review of policy and practice. Evergreen Education Group. Retrieved February 10, 2020, from https://static1.squarespace.com/static/59381b9a17bffc68bf625df4/t/5949b5db725e25cad52277e2/1498002924767/KeepingPace+2012.pdf/.

  • Wefald, A. J., & Downey, R. G. (2009). Construct dimensionality of engagement and its relation with satisfaction. The Journal of Psychology,143(1), 91–112. https://doi.org/10.3200/JRLP.143.1.91-112.

    Article  Google Scholar 

  • Whetten, D. A. (1989). What constitutes a theoretical dontribution? The Academy of Management Review,14(4), 490–495. https://doi.org/10.2307/258554.

    Article  Google Scholar 

  • Wigfield, A., & Eccles, J. S. (2000). Expectancy–value theory of achievement motivation. Contemporary Educational Psychology,25, 68–81. https://doi.org/10.1006/ceps.1999.1015.

    Article  Google Scholar 

  • Zimmerman, B. J., & Kitsantas, A. (1997). Developmental phases in self-regulation: Shifting from process goals to outcome goals. Journal of Educational Psychology,89(1), 29–36. https://doi.org/10.1037//0022-0663.89.1.29.

    Article  Google Scholar 

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Borup, J., Graham, C.R., West, R.E. et al. Academic Communities of Engagement: an expansive lens for examining support structures in blended and online learning. Education Tech Research Dev 68, 807–832 (2020). https://doi.org/10.1007/s11423-020-09744-x

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