Teachers’ and students’ needs for autonomy, competence, and relatedness as predictors of students’ achievement
- 970 Downloads
- 2 Citations
Abstract
Self-determination theory and research suggest that students are more motivated and have higher achievement when teachers support their psychological needs for autonomy, competence, and relatedness. However, teachers might have difficulty supporting their students’ psychological needs if their own psychological needs are not met, which might affect students’ need satisfaction and ultimately their achievement. We explored this possibility by testing hierarchical models of the relationships of teachers’ and students’ psychological need satisfaction, and students’ reading achievement in third and fifth grades using multilevel analysis for complex survey data. Participants consisted of 10,395 third-grade students and their teachers, in the Educational Childhood Longitudinal Study—Kindergarten (ECLS-K) database. Results showed that teachers who report having low autonomy at work (i.e., those who report that they lack the autonomy to influence school policy and/or to choose how and what they teach, and/or those who perceive that administrative duties and paperwork interfere with their teaching) are less likely to support their students’ need for autonomy compared to teachers who report having higher autonomy at work. Also teachers’ support of their students’ autonomy and their students’ perceptions of academic competence were positively related to students’ reading achievement in both 3rd and 5th grades. In contrast, students’ relatedness to peers was negatively related to their reading achievement in both 3rd and 5th grades. This study provides evidence indicating the potential importance of supporting teachers’ autonomy to enable them to enhance the autonomy of their students and ultimately their students’ reading achievement.
Keywords
Self-determination theory Autonomy Relatedness Competence AchievementReferences
- Allinder, R. M. (1994). The relationship between efficacy and the instructional practices of special education teachers and consultants. Teacher Education and Special Education, 17, 86–95.CrossRefGoogle Scholar
- Altermatt, E. R., & Pomerantz, E. M. (2003). The development of competence-related and motivational beliefs: An investigation of similarity and influence among friends. Journal of Educational Psychology, 95(1), 111–123.CrossRefGoogle Scholar
- Ames, C. (1990). Motivation: What teachers need to know. Teachers College Record, 91, 409–421.Google Scholar
- Ames, C. (1992). Classrooms: Goals, structures, and students’ motivation. Journal of Educational Psychology, 84, 261–271.CrossRefGoogle Scholar
- Ashton, P. T., & Webb, R. B. (1986). Making a difference: Teachers’ sense of efficacy and student achievement. New York: Longman.Google Scholar
- Assor, A., Kaplan, H., & Roth, G. (2002). Choice is good, but relevance is excellent: Autonomy-enhancing and suppressing teacher behaviors predicting student engagement in schoolwork. British Journal of Educational Psychology, 72, 261–278.CrossRefGoogle Scholar
- Bandura, A. (1997). Self-efficacy: The exercise of control. New York: Freeman.Google Scholar
- Bandura, A., & Cervone, D. (1983). Self-evaluative and self-efficacy systems. Journal of Personality and Social Psychology, 45, 1017–1028.CrossRefGoogle Scholar
- Baumeister, R. F., Bratslavsky, E., Muraven, M., & Tice, D. M. (1998). Ego depletion: Is the active self a limited resource? Journal of Personality and Social Psychology, 74(5), 1252–1265.CrossRefGoogle Scholar
- Baumeister, R. F., Muraven, M., & Tice, D. M. (2000). Ego depletion: A resource model of volition, self-regulation, and controlled processing. Social Cognition, 18(2), 130–150.CrossRefGoogle Scholar
- Bishop, J., Bishop, M., Gelbwasser, L., Green, S., & Zuckerman, A. (2003). Why do we harass nerds and freaks? Towards a theory of students’ culture and norms. In D. Ravitch (Ed.), Brookings papers on education policy. Washington, DC: Brookings Institution.Google Scholar
- Boggiano, A. K., & Katz, P. (1991). Maladaptive achievement patterns in students: The role of teachers’ controlling strategies. Journal of Social Issues, 47(4), 35–51.CrossRefGoogle Scholar
- Brophy, J. (2004). Motivating student to learn (2nd ed.). Mahwah, NJ: Erlbaum.Google Scholar
- Chang, A. F., Berger, S. E., & Chang, B. (1981). The relationship of student self-esteem and teacher empathy to classroom learning. Psychology: A Quarterly Journal of Human Behavior, 18(4), 21–25.Google Scholar
- Chatzisarantis, N. L., & Hagger, M. S. (2009). Effects of an intervention based on self-determination theory on self-reported leisure-time physical activity participation. Psychology and Health, 24(1), 29–48.CrossRefGoogle Scholar
- Cheon, S. H., & Reeve, J. (2015). A classroom-based intervention to help teachers decrease students’ amotivation. Contemporary Educational Psychology, 40, 99–111.CrossRefGoogle Scholar
- Cole, D. A., Maxwell, S. E., Martin, J. M., Peeke, L. G., Seroczynski, A. D., Tram, J. M., et al. (2001). The development of multiple domains of child and adolescent self-concept: A cohort sequential longitudinal design. Child Development, 72, 1723–1746.CrossRefGoogle Scholar
- Corno, L., & Rohrkemper, M. (1985). The intrinsic motivation to learn in the classroom. In R. Ames & C. Ames (Eds.), Research on motivation in education (Vol. 2, pp. 53–90). New York: Academic Press.Google Scholar
- Deci, E. L., Koestner, R., & Ryan, R. M. (1999). The undermining effect is a reality after all: Extrinsic rewards, task interest, and self-determination. Psychological Bulletin, 125, 692–700.CrossRefGoogle Scholar
- Deci, E. L., Nezlek, J., & Sheinman, L. (1981a). Characteristics of the rewarder and intrinsic motivation of the rewardee. Journal of Personality and Social Psychology, 40, 1–10.CrossRefGoogle Scholar
- Deci, E. L., & Ryan, R. M. (2000). The “what” and “why” of goal pursuits: Human needs and the self-determination of behavior. Psychological Inquiry, 11(4), 227–268.CrossRefGoogle Scholar
- Deci, E. L., Schwartz, A. J., Sheinman, L., & Ryan, R. M. (1981b). An instrument to assess adults’ orientations toward control versus autonomy with children: Reflections on intrinsic motivation and perceived competence. Journal of Educational Psychology, 73, 642–650.CrossRefGoogle Scholar
- Deci, E. L., Spiegel, N. H., Ryan, R. M., Koestner, R., & Kauffman, M. (1982). The effects of performance standards on teaching styles: The behavior of controlling teachers. Journal of Educational Psychology, 74, 852–859.CrossRefGoogle Scholar
- Deci, E. L., Vallerand, R. J., Pelletier, L. G., & Ryan, R. M. (1991). Motivation and education: The self-determination perspective. Educational Psychologist, 26, 325–346. doi: 10.1080/00461520.1991.9653137.CrossRefGoogle Scholar
- Dweck, C. S., Chiu, C., & Hong, Y. (1995). Implicit theories and their role in judgments and reactions: A world from two perspectives. Psychological Inquiry, 6, 267–285.CrossRefGoogle Scholar
- Eccles, J. (2004). Schools, academic motivation, and stage-environment fit. In R. Lerner & L. Steinberg (Eds.), Handbook of adolescent psychology (pp. 125–153). New York: Wiley.Google Scholar
- Eccles, J., Buchanan, C. M., Flanagan, C., Fuligni, A., Midgley, C., & Yee, D. (1991). Control versus autonomy during early adolescence. Journal of Social Issues, 47(4), 53–68.CrossRefGoogle Scholar
- Edmunds, J., Ntoumanis, N., & Duda, J. L. (2008). Testing a self-determination theory-based teaching style intervention in the exercise domain. European Journal of Social Psychology, 38(2), 375–388.CrossRefGoogle Scholar
- Flink, C., Boggiano, A. K., & Barrett, M. (1990). Controlling teaching strategies: Undermining children’s self-determination and performance. Journal of Personality and Social Psychology, 59, 916–924.CrossRefGoogle Scholar
- Fuchs, L. S., Fuchs, D., & Bishop, N. (1992). Instructional adaptation for students at risk. Journal of Educational Research, 86, 70–84.CrossRefGoogle Scholar
- Furrer, C., & Skinner, E. (2003). Sense of relatedness as a factor in children’s academic engagement and performance. Journal of Educational Psychology, 95(1), 148–162.CrossRefGoogle Scholar
- Furtak, E. M., & Kunter, M. (2012). Effects of autonomy-supportive teaching on student learning and motivation. Journal of Experimental Education, 80(3), 284–316. doi: 10.1080/00220973.2011.573019.CrossRefGoogle Scholar
- Gibson, S., & Dembo, M. (1984). Teacher efficacy: A construct validation. Journal of Educational Psychology, 76(4), 569–582.CrossRefGoogle Scholar
- Goddard, R. D., Hoy, W. K., & Woolfolk-Hoy, A. (2000). Collective teacher efficacy: Its meaning, measure, and impact on student achievement. American Educational Research Journal, 37, 479–507.CrossRefGoogle Scholar
- Goodenow, C. (1992). Strengthening the links between educational psychology and the study of social contexts. Educational Psychologist, 27, 177–196.CrossRefGoogle Scholar
- Gottfried, A. E., Fleming, J. S., & Gottfried, A. W. (2001). Continuity of academic intrinsic motivation from childhood through late adolescence: A longitudinal study. Journal of Educational Psychology, 93, 3–13.CrossRefGoogle Scholar
- Graham, S., & Golan, S. (1991). Motivational influences on cognition: Task involvement, ego involvement, and depth of information processing. Journal of Educational Psychology, 83, 187–194.CrossRefGoogle Scholar
- Grolnick, W. S., & Ryan, R. M. (1987). Autonomy in children’s learning: An experimental and individual difference investigation. Journal of Personality and Social Psychology, 52, 890–898.CrossRefGoogle Scholar
- Guay, F., Ratelle, C. F., Roy, A., & Litalien, D. (2010). Academic self-concept, autonomous academic motivation, and academic achievement: Mediating and additive effects. Learning and Individual Differences, 20(6), 644–653.CrossRefGoogle Scholar
- Guay, F., & Vallerand, R. J. (1996). Social context, student’s motivation, and academic achievement: Toward a process model. Social Psychology of Education, 1(3), 211–233.CrossRefGoogle Scholar
- Guskey, T. R. (1988). Teacher efficacy, self-concept, and attitudes toward the implementation of instructional innovation. Teaching and Teacher Education, 4(1), 63–69.CrossRefGoogle Scholar
- Halpern, D. F. (2006). Assessing gender gaps in learning and academic achievement. In P. A. Alexander & P. H. Winne (Eds.), Handbook of educational psychology (2nd ed., pp. 635–653). Mahwah, NJ: Erlbaum.Google Scholar
- Harris, D. N., & Sass, T. R. (2007). Teacher training, teacher quality, and student achievement. (CALDER Working Paper No. 3). Washington, DC: CALDER.Google Scholar
- Herbert, J., & Stipek, K. (2005). The emergence of gender differences in children’s perceptions of their academic competence. Journal of Applied Developmental Psychology, 26(3), 276–295.CrossRefGoogle Scholar
- Hoelter, J. W. (1983). The analysis of covariance structures goodness-of-fit indices. Sociological Methods and Research, 11(3), 325–344.CrossRefGoogle Scholar
- Horvat, E., & Lewis, K. (2003). Reassessing the burden of “acting white”: The importance of peer groups in managing academic success. Sociology of Education, 76(4), 265–280.CrossRefGoogle Scholar
- Hoy, W. K., & Woolfolk, A. E. (1993). Teachers’ sense of efficacy and the organizational health of schools. Elementary School Journal, 93, 356–372.CrossRefGoogle Scholar
- Hughes, J. N., Luo, O. K., & Loyd, L. K. (2008). Teacher-student support, effortful engagement, and achievement: A 3-year longitudinal study. Journal of Educational Psychology, 100(1), 1–14.CrossRefGoogle Scholar
- Ingersoll, R. M., & Smith, T. M. (2003). The wrong solution to the teacher shortage. Educational Leadership, 60(8), 30.Google Scholar
- Kaplan, H., & Assor, A. (2012). Enhancing autonomy-supportive I-Thou dialogue in schools: Conceptualization and socio-emotional effects of an intervention program. Social Psychology of Education, 15(2), 251–269.CrossRefGoogle Scholar
- Klassen, R. (2006). Too much confidence? The self-efficacy beliefs of adolescents with learning disabilities. In F. Pajares & T. Urdan (Eds.), self-efficacy beliefs of adolescents (pp. 181–200). Greenwich, CT: Information Age.Google Scholar
- Liu, X. S., & Meyer, J. P. (2005). Teachers’ perceptions of their jobs: A multilevel analysis of the teacher follow-up survey for 1994–1995. Teachers College Record, 107(5), 985–1003.CrossRefGoogle Scholar
- Loeb, S., Darling-Hammond, L., & Luczak, J. (2005). How teaching conditions predict teacher turnover in California schools. Peabody Journal of Education, 80(3), 44–70.CrossRefGoogle Scholar
- Marsh, H. W. (1988). Self description questionnaire: A theoretical and empirical basis for the measurement of multiple dimensions of preadolescent self-concept: A test manual and a research monograph. San Antonio, TX: Psychological Corporation.Google Scholar
- Marsh, H. W. (1989). Age and sex effects in multiple dimensions of self-concept: Preadolescence to early adulthood. Journal of Educational Psychology, 81, 417–430.CrossRefGoogle Scholar
- Marsh, H. W. (1990). A multidimensional, hierarchical model of self-concept: Theoretical and empirical justification. Educational Psychology Review, 2(2), 77–172.CrossRefGoogle Scholar
- Marsh, H. W. (1992). Self-description questionnaire: I. Campbelltown, NSW: University of Western Sydney, Macarthur.Google Scholar
- McAllister, G., & Irvine, J. J. (2002). The role of empathy in teaching culturally diverse students: A qualitative study of teachers’ beliefs. Journal of Teacher Education, 53(5), 433–443.CrossRefGoogle Scholar
- Mickelson, R. A. (1990). The attitude-achievement paradox among black adolescents. Sociology of Education, 63, 44–61.CrossRefGoogle Scholar
- Midgley, C., & Edelin, K. C. (1998). Middle school reform and early adolescent well-being: The good news and the bad. Educational Psychologist, 33(4), 195–206.CrossRefGoogle Scholar
- Midgley, C., Feldlaufer, H., & Eccles, J. (1989). Student/teacher relations and attitudes toward mathematics before and after the transition to junior high school. Child Development, 60, 981–992.CrossRefGoogle Scholar
- Moller, A. C., Deci, E. L., & Ryan, R. M. (2006). Choice and ego-depletion: The moderating role of autonomy. Personality and Social Psychology Bulletin, 32(8), 1024–1036.CrossRefGoogle Scholar
- Multon, K. D., Brown, S. D., & Lent, R. W. (1991). Relation of self-efficacy beliefs to academic outcomes: A meta-analytic investigation. Journal of Counseling Psychology, 38(1), 30–38.CrossRefGoogle Scholar
- Muraven, M., & Baumeister, R. F. (2000). Self-regulation and depletion of limited resources: Does self-control resemble a muscle? Psychological Bulletin, 126(2), 247–259.CrossRefGoogle Scholar
- Muthén, L. K., & Muthén, B. O. (2010). Mplus user’s guide. Los Angeles, CA: Muthén & Muthén.Google Scholar
- National Center for Educational Statistics. (2015). The nation’s report card. Washington, DC: U. S. Department of Education, Office of Educational Research and Improvement. Retrieved October 12, 2015 from http://www.nationsreportcard.gov/reading_math_2015/#?grade=4.
- Natriello, G., & McDill, E. L. (1986). Performance standards, student effort on homework, and academic achievement. Sociology of Education, 59, 18–31.CrossRefGoogle Scholar
- Newby, T. J. (1991). Classroom motivation: Strategies of first-year teachers. Journal of Educational Psychology, 83, 195–200.CrossRefGoogle Scholar
- Newman, F. M., Rutter, R. A., & Smith, M. S. (1989). Organizational factors that affect school sense of efficacy, community, and expectations. Sociology of Education, 62, 221–238.CrossRefGoogle Scholar
- Ostroff, C. (1992). The relationship between satisfaction, attitudes, and performance: An organizational level analysis. Journal of Applied Psychology, 77, 963–974.CrossRefGoogle Scholar
- Pajares, F. (1996). Self-efficacy beliefs in academic settings. Review of Educational Research, 66, 543–578.CrossRefGoogle Scholar
- Pelletier, L. G., Séguin-Lévesque, C., & Legault, L. (2002). Pressure from above and pressure from below as determinants of teachers’ motivation and teaching behaviors. Journal of Educational Psychology, 94, 186–196.CrossRefGoogle Scholar
- Pintrich, P. R., & DeGroot, E. V. (1990). Motivational and self-regulated learning components of classroom academic performance. Journal of Educational Psychology, 82, 33–40.CrossRefGoogle Scholar
- Pollack, J. M., Atkins-Burnett, S., Najarian, M., & Rock, D. A. (2005a). Early childhood longitudinal study, kindergarten class of 1998–1999 (ECLS–K), psychometric report for the fifth grade (NCES 2006–036). Washington, DC: National Center for Education Statistics, U.S. Department of Education.Google Scholar
- Pollack, J., Atkins-Burnett, S., Rock, D., & Weiss, M. (2005b). Early childhood longitudinal study, kindergarten class of 1998–1999 (ECLS-K), psychometric report for the third grade (NCES 2005–062). Washington, DC: U.S. Department of Education, National Center for Education Statistics.Google Scholar
- Ramdass, D., & Zimmerman, B. J. (2008). Effects of self-correction strategy training on middle school students’ self-efficacy, self-evaluation, and mathematics division learning. Journal of Advanced Academics, 20(1), 18–41.Google Scholar
- Reeve, J. (2010). Teachers are not autonomy supportive: An unfortunate truth. Paper presented at the Fourth International Conference on Self-Determination Theory, Ghent, Belgium.Google Scholar
- Reeve, J., Bolt, E., & Cai, Y. (1999). Autonomy-supportive teachers: How they teach and motivate students. Journal of Educational Psychology, 9, 537–548.CrossRefGoogle Scholar
- Reinders, H., & Balcikanli, C. (2011). Learning to foster autonomy: The role of teacher education materials. Studies in Self-Access Learning Journal, 2(1), 15–25.Google Scholar
- Rice, J. K. (2013). Learning from experience: Evidence on the impact and distribution of teacher experience and the implications for teacher policy. Education Finance and Policy, 8(3), 332–348.CrossRefGoogle Scholar
- Roth, G., Assor, A., Kanat-Maymon, Y., & Kaplan, H. (2007). Autonomous motivation for teaching: How self-determined teaching may lead to self-determined learning. Journal of Educational Psychology, 99, 761–774.CrossRefGoogle Scholar
- Ryan, A. (2001). The peer group as a context for the development of young adolescent motivation and achievement. Child Development, 72(4), 1135–1150.CrossRefGoogle Scholar
- Ryan, R. M., & Deci, E. L. (2000). Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being. American Psychologist, 55, 68–78.CrossRefGoogle Scholar
- Ryan, R. M., & Deci, E. L. (2006). Self-regulation and the problem of human autonomy: Does psychology need choice, self-determination, and will? Journal of Personality, 74(6), 1557–1586.CrossRefGoogle Scholar
- Ryan, R. M., Stiller, J., & Lynch, J. H. (1994). Representations of relationships to teachers, parents, and friends as predictors of academic motivation and self-esteem. Journal of Early Adolescence, 14, 226–249.CrossRefGoogle Scholar
- Schunk, D. H. (1984). Self-efficacy perspective on achievement behavior. Educational Psychologist, 19, 48–58.CrossRefGoogle Scholar
- Schunk, D. H. (2003). Self-efficacy for reading and writing: Influence of modeling, goal setting, and self-evaluation. Reading and Writing Quarterly, 19, 159–172.CrossRefGoogle Scholar
- Schunk, D. H., & Pajares, F. (2005). Competence beliefs and academic functioning. In A. J. Elliott & C. S. Dweck (Eds.), Handbook of competence and motivation (pp. 85–104). New York: Guilford Press.Google Scholar
- Skinner, E. A., & Belmont, M. J. (1993). Motivation in the classroom: Reciprocal effects of teacher behavior and students’ engagement across the school year. Journal of Educational Psychology, 85, 571–581.CrossRefGoogle Scholar
- Soenens, B., & Vansteenkiste, M. (2005). Antecedents and outcomes of self-determination in 3 life domains: The role of parents’ and teachers’ autonomy support. Journal of Youth and Adolescence, 34(6), 589–604.CrossRefGoogle Scholar
- Solomon, D., Battistich, V., Watson, M., Schaps, E., & Lewis, C. (2000). A six-district study of educational change: Direct and mediated effects of the child development project. Social Psychology of Education, 4, 3–51.CrossRefGoogle Scholar
- Spencer, M., Noll, E., Stoltzfus, J., & Harpalani, V. (2001). Identity and school adjustment: Revisiting the “acting white” assumption. Educational Psychologist, 36(1), 21–30.CrossRefGoogle Scholar
- Stefanou, C. R., Perencevich, K. C., DiCintio, M., & Turner, J. C. (2004). Supporting autonomy in the classroom: Ways teachers encourage student decision making and ownership. Educational Psychologist, 39(2), 97–110.CrossRefGoogle Scholar
- Stein, M. K., & Wang, M. C. (1988). Teacher development and school improvement: The process of teacher change. Teaching and Teacher Education, 4, 171–187.CrossRefGoogle Scholar
- Stipek, D. (2002). Motivation to learn: From theory to practice (4th ed.). Needham Heights, MA: Allyn & Bacon.Google Scholar
- Stone, N. J. (2000). Exploring the relationship between calibration and self-regulated learning. Educational Psychology Review, 12(4), 437–475.CrossRefGoogle Scholar
- Taylor, G., Jungert, T., Mageau, G. A., Schattke, K., Dedic, H., Rosenfield, S., et al. (2014). A self-determination theory approach to predicting school achievement over time: The unique role of intrinsic motivation. Contemporary Educational Psychology, 39(4), 342–358.CrossRefGoogle Scholar
- Taylor, I. M., Ntoumanis, N., & Standage, M. (2008). A self-determination theory approach to understanding the antecedents of teachers’ motivational strategies in physical education. Journal of Sport and Exercise Psychology, 30(1), 75–94.CrossRefGoogle Scholar
- Tourangeau, K., Brick, M., Thanh, L., Siu, W., Weant, M., Nord, C., et al. (2004). Early childhood longitudinal study, kindergarten class of 1998–1999 (ECLS-K) user’s manual for the ECLS-K third grade public-use data file and electronic code book. (NCES 2004-001). Washington, DC: National Center for Education Statistics, U.S. Department of Education.Google Scholar
- Tourangeau, K., Nord, C., Lê, T., Pollack, J. M., & Atkins-Burnett, S. (2006). Early childhood longitudinal study, kindergarten class of 1998–1999 (ECLS-K) combined user’s manual for the ECLS-K fifth-grade data files and electronic codebooks (NCES 2006–032). Washington, DC: National Center for Education Statistics, U.S. Department of Education.Google Scholar
- Tschannen-Moran, M., & Woolfolk Hoy, A. (2001). Teacher efficacy: Capturing an elusive construct. Teaching and Teacher Education, 17(7), 783–805.CrossRefGoogle Scholar
- Tschannen-Moran, M., Woolfolk Hoy, A., & Hoy, W. K. (1998). Teacher efficacy: Its meaning and measure. Review of Educational Research, 68, 202–248.CrossRefGoogle Scholar
- Vallerand, R. J., Fortier, M. S., & Guay, F. (1997). Self-determination and persistence in a real-life setting: Toward a motivational model of high school dropout. Journal of Personality and Social Psychology, 72, 1161–1176.CrossRefGoogle Scholar
- Van Laar, C. (2000). The paradox of low academic achievement but high self-esteem in African American students: An attributional account. Educational Psychology Review, 12(1), 33–61.CrossRefGoogle Scholar
- Warren, L. L., & Payne, B. D. (1997). Impact of middle grades’ organization on teachers’ efficacy and environmental perceptions. Journal of Educational Research, 90, 301–308.CrossRefGoogle Scholar
- Woolfolk, A. E., Rosoff, B., & Hoy, W. K. (1990). Teachers’ sense of efficacy and their beliefs about managing students. Teaching and Teacher Education, 6, 137–148.CrossRefGoogle Scholar
- Woolfolk Hoy, A., & Burke-Spero, R. (2005). Changes in teacher efficacy during the early years of teaching: A comparison of four measures. Teaching and Teacher Education, 21(4), 343–356.CrossRefGoogle Scholar
- Yoon, J. S. (2002). Teacher characteristics as predictors of teacher-student relationships: Stress, negative affect, and self-efficacy. Social Behavior and Personality, 30, 485–494.CrossRefGoogle Scholar