메뉴 건너뛰기




Volumn , Issue , 2007, Pages 224-237

The role of social networks in students' learning Experiences

Author keywords

Computer science education; Higher education; Learning process; Social network; Student experience

Indexed keywords

EDUCATION COMPUTING; ENGINEERING EDUCATION; ENGINEERING RESEARCH; SOCIAL NETWORKING (ONLINE); STUDENTS;

EID: 85016084040     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: 10.1145/1345443.1345442     Document Type: Conference Paper
Times cited : (118)

References (101)
  • 2
    • 0141614093 scopus 로고    scopus 로고
    • Ontocopi-using ontology based network analysis to identify communities of practice
    • Alani, H., Dasmahapatra, S., O'hara, K., and Shadbolt, N. Ontocopi-using ontology based network analysis to identify communities of practice. IEEE Intelligent Systems 18 (2003), 18-25.
    • (2003) IEEE Intelligent Systems , vol.18 , pp. 18-25
    • Alani, H.1    Dasmahapatra, S.2    O'Hara, K.3    Shadbolt, N.4
  • 5
    • 27644593107 scopus 로고
    • Using computer-mediated communication in an educational context: Educational outcomes and pedagogical lessons of computer conferencing
    • restricted access
    • Archee, R. Using computer-mediated communication in an educational context: Educational outcomes and pedagogical lessons of computer conferencing. The Electronic Journal of Communication 3, 2 (1993). http://www.cios.org/getfile/ARCHEE-V3N293 [restricted access].
    • (1993) The Electronic Journal of Communication , vol.3 , Issue.2
    • Archee, R.1
  • 6
    • 0004079398 scopus 로고
    • Interaction Process Analysis
    • Cambridge, MA: Addison-Wesley
    • Bales, R. F. Interaction Process Analysis. A Method for the Study of Small Groups. Cambridge, MA: Addison-Wesley, 1950/1951.
    • (1950) A Method for the Study of Small Groups
    • Bales, R.F.1
  • 8
    • 0017472917 scopus 로고
    • Self-efficacy: Towards a unifying theory of behavioral change
    • Bandura, A. Self-efficacy: Towards a unifying theory of behavioral change. Psychological Review 84 (1977), 191-215.
    • (1977) Psychological Review , vol.84 , pp. 191-215
    • Bandura, A.1
  • 9
    • 84863430135 scopus 로고    scopus 로고
    • What do cs students strive to learn?
    • Berglund, A., and Eckerdal, A. What do cs students strive to learn? Computer Science Education 16, 3 (2006), 185-195.
    • (2006) Computer Science Education , vol.16 , Issue.3 , pp. 185-195
    • Berglund, A.1    Eckerdal, A.2
  • 10
    • 0027421413 scopus 로고
    • Problem-based learning: Have the expectations been met?
    • Berkson, L. Problem-based learning: Have the expectations been met? Academic Medicine 68, 10 (1993), S79-S88.
    • (1993) Academic Medicine , vol.68 , Issue.10 , pp. S79-S88
    • Berkson, L.1
  • 11
    • 33846605444 scopus 로고    scopus 로고
    • PhD thesis, MIT, May
    • Bolin, M. End-User Programming for the Web. PhD thesis, MIT, http://groups.csail.mit.edu/uid/projects/chickenfoot/mbolin-thesis.pdf, May 2005.
    • (2005) End-User Programming for the Web
    • Bolin, M.1
  • 12
    • 14644421456 scopus 로고    scopus 로고
    • Learning computer science and engineering in context
    • Booth, S. Learning computer science and engineering in context. Computer Science Education 11, 3 (2001), 169-188.
    • (2001) Computer Science Education , vol.11 , Issue.3 , pp. 169-188
    • Booth, S.1
  • 13
    • 0001856469 scopus 로고
    • Face-to-face versus computer-mediated communication: A synthesis of the experimental literature
    • Bordia, P. Face-to-face versus computer-mediated communication: A synthesis of the experimental literature. The Journal of Business Communication 34, 1 (1992), 99-120.
    • (1992) The Journal of Business Communication , vol.34 , Issue.1 , pp. 99-120
    • Bordia, P.1
  • 14
    • 85050331466 scopus 로고
    • Interaction of individuals in reconstituted groups
    • Borgatta, E. F., and Bales, R. F. Interaction of individuals in reconstituted groups. Sociometry 16, 4 (1953), 302-320.
    • (1953) Sociometry , vol.16 , Issue.4 , pp. 302-320
    • Borgatta, E.F.1    Bales, R.F.2
  • 15
    • 33748691154 scopus 로고    scopus 로고
    • Wikis, blogs and podcasts: A new generation of web-based tools for virtual collaborative clinical practice and education
    • August
    • Boulos, M., Maramba, I., and Wheeler, S. Wikis, blogs and podcasts: A new generation of web-based tools for virtual collaborative clinical practice and education. BMC Medical Education 6, 41 (August 2006).
    • (2006) BMC Medical Education , vol.6 , Issue.41
    • Boulos, M.1    Maramba, I.2    Wheeler, S.3
  • 16
    • 10044266339 scopus 로고    scopus 로고
    • Semantic blogging and decentralized knowledge management
    • December
    • Cayzer, S. Semantic blogging and decentralized knowledge management. Communications of the ACM 47, 12 (December 2004), 47-52.
    • (2004) Communications of the ACM , vol.47 , Issue.12 , pp. 47-52
    • Cayzer, S.1
  • 17
    • 85027549141 scopus 로고    scopus 로고
    • May
    • Chin, M. Facebook statistics. http://static.ak.facebook.com/press/facebook-statistics.pdf, May 2007.
    • (2007) Facebook Statistics
    • Chin, M.1
  • 18
    • 85027554133 scopus 로고    scopus 로고
    • Citeulike. http://www.citeulike.org.
    • Citeulike
  • 19
    • 85027587593 scopus 로고    scopus 로고
    • Classmates. http://www.classmate.com.
    • Classmates
  • 20
    • 0038707609 scopus 로고    scopus 로고
    • Recruiting and retaining women in undergraduate computing majors
    • Cohoon, J. Recruiting and retaining women in undergraduate computing majors. SIGCSE Bulletin 34, 2 (2002), 48-52.
    • (2002) SIGCSE Bulletin , vol.34 , Issue.2 , pp. 48-52
    • Cohoon, J.1
  • 21
    • 79251502499 scopus 로고    scopus 로고
    • Connecting the new organisation. How bp amoco encourages post-merger collaboration
    • Collison, C. Connecting the new organisation. how bp amoco encourages post-merger collaboration. Knowledge Management Review (2000).
    • (2000) Knowledge Management Review
    • Collison, C.1
  • 23
    • 84875580842 scopus 로고    scopus 로고
    • Dailymotion. http://www.dailymotion.com.
    • Dailymotion
  • 24
    • 84873444986 scopus 로고    scopus 로고
    • del.icio.us. http://del.icio.us/.
    • Del.icio.us
  • 26
    • 84886287589 scopus 로고    scopus 로고
    • Facebook. http://www.facebook.com/.
    • Facebook
  • 27
    • 85027569026 scopus 로고    scopus 로고
    • Filmtrust. http://trust.mindswap.org/FilmTrust/.
    • Filmtrust
  • 28
    • 85027551133 scopus 로고    scopus 로고
    • Flickr. http://www.flickr.com/.
    • Flickr
  • 29
    • 85027552410 scopus 로고    scopus 로고
    • Friendsreunited. http://www.friendsreunited.co.uk.
    • Friendsreunited
  • 30
    • 84911356001 scopus 로고    scopus 로고
    • Friendster. http://www.friendster.com/.
    • Friendster
  • 33
    • 21644483248 scopus 로고    scopus 로고
    • Leveraging social networks for information sharing
    • 3
    • Goecks, J., and Mynatt, E. Leveraging social networks for information sharing. Computer Supported Cooperative Work 04 6, 3 (2004), 328-331.
    • (2004) Computer Supported Cooperative Work , vol.4 , Issue.6 , pp. 328-331
    • Goecks, J.1    Mynatt, E.2
  • 34
    • 0002945160 scopus 로고    scopus 로고
    • Social presence as a predictor of satisfaction within a computer mediated conferencing environment
    • Gunawardena, C., and Zittle, F. Social presence as a predictor of satisfaction within a computer mediated conferencing environment. American Journal of Distance Education, 11, 3 (1997), 8-26.
    • (1997) American Journal of Distance Education , vol.11 , Issue.3 , pp. 8-26
    • Gunawardena, C.1    Zittle, F.2
  • 35
    • 79960316683 scopus 로고    scopus 로고
    • Find better friends? Re-configuration of personal networks by neighborhood matchmaker method
    • Hamasaki, M., and Takeda, H. Find better friends? re-configuration of personal networks by neighborhood matchmaker method. In SWAFT (2003), pp. 73-76.
    • (2003) SWAFT , pp. 73-76
    • Hamasaki, M.1    Takeda, H.2
  • 36
    • 0034441727 scopus 로고    scopus 로고
    • Shift happens: Online education as a new paradigm in learning
    • Harasim, L. Shift happens: online education as a new paradigm in learning. Internet and Higher Education 3 (2000), 41-61.
    • (2000) Internet and Higher Education , vol.3 , pp. 41-61
    • Harasim, L.1
  • 37
    • 85027557072 scopus 로고    scopus 로고
    • Finding just enough of that sticky stuff
    • Heath, C., and Heath, D. Finding just enough of that sticky stuff. Brandweek 48, 1 (2007), 21-25.
    • (2007) Brandweek , vol.48 , Issue.1 , pp. 21-25
    • Heath, C.1    Heath, D.2
  • 40
    • 0036114834 scopus 로고    scopus 로고
    • The relationship of group process variables and team performance. A team-level analysis in a field setting
    • Jordan, M. H., Feild, H. S., and Armenakis, A. A. The relationship of group process variables and team performance. a team-level analysis in a field setting. Small Group Research 33, 1 (2002), 121-150.
    • (2002) Small Group Research , vol.33 , Issue.1 , pp. 121-150
    • Jordan, M.H.1    Feild, H.S.2    Armenakis, A.A.3
  • 41
    • 34247348933 scopus 로고    scopus 로고
    • Problems in problem-based learning - experiences, analysis and lessons learned on an introductory programming course
    • Kinnunen, P., and Malmi, L. Problems in problem-based learning - experiences, analysis and lessons learned on an introductory programming course. Informatics in Education 4, 2 (2005), 193-215.
    • (2005) Informatics in Education , vol.4 , Issue.2 , pp. 193-215
    • Kinnunen, P.1    Malmi, L.2
  • 42
    • 34247362448 scopus 로고    scopus 로고
    • Why students drop out cs1 courses?
    • ACM
    • Kinnunen, P., and Malmi, L. Why students drop out cs1 courses? In Proceedings of ICER 2006 (2006), ACM, pp. 97-108.
    • (2006) Proceedings of ICER 2006 , pp. 97-108
    • Kinnunen, P.1    Malmi, L.2
  • 43
    • 38849122604 scopus 로고    scopus 로고
    • Through the eyes of instructors: A phenomenographic investigation of student success
    • Kinnunen, P., McCartney, R., Murphy, L., and Thomas, L. Through the eyes of instructors: A phenomenographic investigation of student success. In Proceedings of ICER (2007).
    • (2007) Proceedings of ICER
    • Kinnunen, P.1    McCartney, R.2    Murphy, L.3    Thomas, L.4
  • 45
    • 0003486460 scopus 로고
    • Cambridge MIT Press, ch. Activity Theory as potential framework for human-computer interaction research
    • Kuutti, K. Context and Consciousness: Activity Theory and Human Computer Interaction. Cambridge MIT Press, 1995, ch. Activity Theory as potential framework for human-computer interaction research, pp. 17-44.
    • (1995) Context and Consciousness: Activity Theory and Human Computer Interaction , pp. 17-44
    • Kuutti, K.1
  • 46
    • 85027580067 scopus 로고    scopus 로고
    • Lastfm. http://www.lastfm.com/.
    • Lastfm
  • 52
    • 84992095964 scopus 로고    scopus 로고
    • Expert finding for collaborative virtual environments
    • December
    • Maybury, M., D'Amore, R., and House, D. Expert finding for collaborative virtual environments. Communications of the ACM 44, 12 (December 2001), 55-56.
    • (2001) Communications of the ACM , vol.44 , Issue.12 , pp. 55-56
    • Maybury, M.1    D'Amore, R.2    House, D.3
  • 54
    • 0034447612 scopus 로고    scopus 로고
    • Expertise recommender: A flexible recommendation sytem and architecture
    • ACM
    • McDonald, D. W., and Ackerman, M. S. Expertise recommender: A flexible recommendation sytem and architecture. In Computer Supported Cooperative Work 2000 (2000), ACM, pp. 231-240.
    • (2000) Computer Supported Cooperative Work 2000 , pp. 231-240
    • McDonald, D.W.1    Ackerman, M.S.2
  • 57
    • 33846316593 scopus 로고    scopus 로고
    • Microsoft live meeting. http://office.microsoft.com/en-us/livemeeting/default.aspx.
    • Microsoft Live Meeting
  • 60
    • 0035220465 scopus 로고    scopus 로고
    • Problem-based learning in a new canadian curriculum
    • Morales-Mann, E. T., and Kaitell, C. A. Problem-based learning in a new canadian curriculum. Journal of Advanced Nursing 33, 1 (2001), 13-19.
    • (2001) Journal of Advanced Nursing , vol.33 , Issue.1 , pp. 13-19
    • Morales-Mann, E.T.1    Kaitell, C.A.2
  • 61
    • 85027566716 scopus 로고    scopus 로고
    • Myspace. http://www.myspace.com/.
    • Myspace
  • 63
    • 48249121335 scopus 로고    scopus 로고
    • Pbl and computer programming - The seven steps method with adaptations
    • Nuutila, E., Torma, S., and Malmi, L. Pbl and computer programming - The seven steps method with adaptations. Computer Science Education 15, 2 (2005), 123-142.
    • (2005) Computer Science Education , vol.15 , Issue.2 , pp. 123-142
    • Nuutila, E.1    Torma, S.2    Malmi, L.3
  • 64
    • 85027565859 scopus 로고    scopus 로고
    • Orkut. http://www.orkut.com/.
    • Orkut
  • 68
    • 84993110618 scopus 로고    scopus 로고
    • Digital natives digital immigrants
    • NCB University Press, (October
    • Prensky, M. Digital natives digital immigrants. On the Horizon, NCB University Press 9, 5 (October 2001).
    • (2001) On the Horizon , vol.9 , Issue.5
    • Prensky, M.1
  • 69
    • 21844516862 scopus 로고
    • Asymmetries in attachments to groups and their members: Distinguishing between common-identity and common-bond groups
    • Prentice, D. A., Miller, D. T., and Lightdale, J. R. Asymmetries in attachments to groups and their members: Distinguishing between common-identity and common-bond groups. Personality and Social Psychology Bulletin 20, 5 (1994), 484-493.
    • (1994) Personality and Social Psychology Bulletin , vol.20 , Issue.5 , pp. 484-493
    • Prentice, D.A.1    Miller, D.T.2    Lightdale, J.R.3
  • 70
    • 85027546076 scopus 로고    scopus 로고
    • Reunion. http://www.reunion.com/.
    • Reunion
  • 71
    • 33845336162 scopus 로고    scopus 로고
    • Reality is our laboratory: Communities of practice in applied computer science
    • January
    • Rohde, M., Klamma, R., Jarke, M., and Wulf, V. Reality is our laboratory: communities of practice in applied computer science. Behaviour & Information Technology 26, 1 (January 2007), 81-94.
    • (2007) Behaviour & Information Technology , vol.26 , Issue.1 , pp. 81-94
    • Rohde, M.1    Klamma, R.2    Jarke, M.3    Wulf, V.4
  • 73
    • 0003362343 scopus 로고
    • Learning in educational settings: Methods of inquiry
    • P. Ramsden (Ed.) New York: Kogan Page
    • Saljo, R. Learning in educational settings: Methods of inquiry. P. Ramsden (Ed.), Improving Learning: New Perspectives (1988), 32-48, New York: Kogan Page.
    • (1988) Improving Learning: New Perspectives , pp. 32-48
    • Saljo, R.1
  • 74
    • 0036124684 scopus 로고    scopus 로고
    • Common bond and common identity groups on the internet: Attachment and normative behavior in on-topic and off-topic chats
    • Sassenburg, K. Common bond and common identity groups on the internet: Attachment and normative behavior in on-topic and off-topic chats. Group Dynamics: Theory, Research, and Practice 6, 2 (2002), 27-37.
    • (2002) Group Dynamics: Theory, Research, and Practice , Issue.6 , pp. 27-37
    • Sassenburg, K.1
  • 75
    • 33845346820 scopus 로고    scopus 로고
    • Learning in asynchronous discussion groups: A multilevel approach to study the influence of student, group and task characteristics
    • January
    • Schellens, T., Van Keer, H., Valcke, M., and De Wever, B. Learning in asynchronous discussion groups: A multilevel approach to study the influence of student, group and task characteristics. Behavior and Information Technology 26, 1 (January 2007), 55-71.
    • (2007) Behavior and Information Technology , vol.26 , Issue.1 , pp. 55-71
    • Schellens, T.1    Van Keer, H.2    Valcke, M.3    De Wever, B.4
  • 76
    • 0020676473 scopus 로고
    • Problem-based learning: Rationale and description
    • Schmidt, H. G. Problem-based learning: rationale and description. Medical Education 17, 1 (1983), 11-16.
    • (1983) Medical Education , vol.17 , Issue.1 , pp. 11-16
    • Schmidt, H.G.1
  • 77
    • 0041517639 scopus 로고    scopus 로고
    • Community of practice: A metaphor for online design?
    • Schwen, T. M., and Hara, N. Community of practice: A metaphor for online design? The Information Society 19 (2003), 257-270.
    • (2003) The Information Society , vol.19 , pp. 257-270
    • Schwen, T.M.1    Hara, N.2
  • 78
    • 34547231905 scopus 로고    scopus 로고
    • Second life. http://www.secondlife.com/.
    • Second Life
  • 79
    • 0036339149 scopus 로고    scopus 로고
    • Harm and duty: Pbl in a media ethics course
    • Slattery, K. L. Loyalty, Harm and duty: Pbl in a media ethics course. Public Relations Review 28 (2002), 185-190.
    • (2002) Public Relations Review , vol.28 , pp. 185-190
    • Slattery1    Loyalty, K.L.2
  • 80
    • 0031233004 scopus 로고    scopus 로고
    • Asynchronous learning networks as a virtual classroom
    • September
    • S.R. Roxanne, and B. Wellman. Asynchronous learning networks as a virtual classroom. Communications of the ACM 40, 9 (September 1997), 44-49.
    • (1997) Communications of the ACM , vol.40 , Issue.9 , pp. 44-49
    • Roxanne, S.R.1    Wellman, B.2
  • 82
    • 0031281558 scopus 로고    scopus 로고
    • Classrooms as communities: Exploring the educational character of student persistence
    • Nov. - Dec
    • Tinto, V. Classrooms as communities: Exploring the educational character of student persistence. Journal of Higher Education 68, 6 (Nov. - Dec. 1997), 599-623.
    • (1997) Journal of Higher Education , vol.68 , Issue.6 , pp. 599-623
    • Tinto, V.1
  • 83
    • 17044381000 scopus 로고    scopus 로고
    • Learning better together: The impact of learning communities on student success in higher education
    • Tinto, V. Learning better together: The impact of learning communities on student success in higher education. Journal of Institutional Research 9, 1 (2000), 48-53.
    • (2000) Journal of Institutional Research , vol.9 , Issue.1 , pp. 48-53
    • Tinto, V.1
  • 84
    • 58149421884 scopus 로고
    • Developmental sequence in small groups
    • Tuckman, B. W. Developmental sequence in small groups. Psychological Bulletin 63, 6 (1965), 384-399.
    • (1965) Psychological Bulletin , vol.63 , Issue.6 , pp. 384-399
    • Tuckman, B.W.1
  • 85
    • 85027566737 scopus 로고    scopus 로고
    • Veoh. http://www.veoh.com/.
    • Veoh
  • 86
    • 0033689626 scopus 로고    scopus 로고
    • Agents to assist in finding help
    • ACM
    • Vivacqua, A., and Lieberman, H. Agents to assist in finding help. In CHI (2000), ACM, pp. 65-72.
    • (2000) CHI , pp. 65-72
    • Vivacqua, A.1    Lieberman, H.2
  • 87
    • 0004115808 scopus 로고
    • Cambridge: Harvard University Press
    • Vygotsky, L. S. Mind in Society. Cambridge: Harvard University Press, 1978.
    • (1978) Mind in Society
    • Vygotsky, L.S.1
  • 88
    • 0141753024 scopus 로고    scopus 로고
    • The embedding of local culture in global communication: Independent internet cafes in london
    • Wakeford, N. The embedding of local culture in global communication: independent internet cafes in london. New Media and Society 5, 3 (2003), 379-399.
    • (2003) New Media and Society , vol.5 , Issue.3 , pp. 379-399
    • Wakeford, N.1
  • 89
    • 0030304043 scopus 로고    scopus 로고
    • Computer-mediated communication: Impersonal, interpersonal, and hyper-personal interaction
    • Walther, J. B. Computer-mediated communication: Impersonal, interpersonal, and hyper-personal interaction. Communication Research 23, 1 (1996), 3-43.
    • (1996) Communication Research , vol.23 , Issue.1 , pp. 3-43
    • Walther, J.B.1
  • 90
    • 0003086831 scopus 로고    scopus 로고
    • The social dimension of asynchronous learning networks
    • Wegerif, R. The social dimension of asynchronous learning networks. Journal of ALN 2 (1998), 34-49.
    • (1998) Journal of ALN , vol.2 , pp. 34-49
    • Wegerif, R.1
  • 91
    • 0034902766 scopus 로고    scopus 로고
    • Physical place and cyberplace: The rise of personalized networking
    • Special Issue on "Networks, Class and Place" . Edited by Talja Blokland and Mike Savage
    • Wellman, B. Physical place and cyberplace: The rise of personalized networking. International Journal of Urban and Regional Research 25, Special Issue on "Networks, Class and Place" (2001). Edited by Talja Blokland and Mike Savage.
    • (2001) International Journal of Urban and Regional Research , vol.25
    • Wellman, B.1
  • 93
    • 0000330269 scopus 로고    scopus 로고
    • Communities of practice: The organizational frontier
    • Wenger, E., and Snyder, W. M. Communities of practice: The organizational frontier. Harvard Business Review (2000).
    • (2000) Harvard Business Review
    • Wenger, E.1    Snyder, W.M.2
  • 95
    • 85027579671 scopus 로고    scopus 로고
    • May
    • Wiki choicetree. http://c2.com/cgi/wiki?WikiChoicetree, May 2005.
    • (2005) Wiki Choicetree
  • 96
    • 84859282631 scopus 로고    scopus 로고
    • May
    • Wikipedia. http://www.wikipedia.org/May 2005.
    • (2005) Wikipedia
  • 98
    • 7444245077 scopus 로고    scopus 로고
    • Cooperative learning in self-organizing e-learner communities based on a multi-agents mechanism
    • Yang, F., Han, P., Shen, R., Kraemer, B. J., and Fan, X. Cooperative learning in self-organizing e-learner communities based on a multi-agents mechanism. Lecture Notes in Artificial Intelligence 03 1 (2003), 490-500.
    • (2003) Lecture Notes in Artificial Intelligence , vol.3 , Issue.1 , pp. 490-500
    • Yang, F.1    Han, P.2    Shen, R.3    Kraemer, B.J.4    Fan, X.5
  • 99
    • 57149123917 scopus 로고    scopus 로고
    • Studiobridge: Using group, location, and event information to bridge online and offline encounters for co-located learning groups
    • ACM Press
    • Yee, S., and Park, K. Studiobridge: Using group, location, and event information to bridge online and offline encounters for co-located learning groups. In Proceedings of the SIGCHI conference on Human factors in computing systems (2005), ACM Press, pp. 551-560.
    • (2005) Proceedings of the SIGCHI Conference on Human Factors in Computing Systems , pp. 551-560
    • Yee, S.1    Park, K.2
  • 100
    • 85027579072 scopus 로고    scopus 로고
    • Youtube. http://www.youtube.com/.
    • Youtube
  • 101
    • 77950322772 scopus 로고    scopus 로고
    • Searching for expertise in social networks: A simulation of potential strategies
    • ACM
    • Zhang, J., and Ackerman, M. S. Searching for expertise in social networks: A simulation of potential strategies. In GROUP (2005), ACM, pp. 71-80.
    • (2005) GROUP , pp. 71-80
    • Zhang, J.1    Ackerman, M.S.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.