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IFIPInternationalFederationforInformationProcessing2013AligningOpen,Physical,andVirtualSpacesintheCISSandboxMarkFrydenbergBentleyUniversity,ComputerInformationSystemsDepartmentWaltham,MAUSAmfrydenberg@bentley.
eduAbstract.
Asstudentsoperateincreasinglyindigitalenvironmentspopulatedbysocialmediatools,theyneedtoleveragethemeffectivelytoaccessonlineresourcesandstayconnectedtothephysicalenvironmentswhichtheyinhabit.
ThispaperreportsonapractitionerresearchprojecttoreconfigureatraditionalComputerInformationSystems(CIS)tutoringlabatabusinessuniversityintothe"CISSandbox.
"ThephysicalfacilitylaunchedwithanalignedonlinepresenceintendedtoengagestudentsandcontributetotheirlearningaboutCIStopics.
Thepaperpresentstherationale,design,andimplementationofthesecollaborativetools,andtheirimpactonthestudents'andtutors'educationalexperience.
QualitativeanalysisfrominterviewswithSandboxstaffandquantitativeanalysisofdatafromapreliminarysurveysuggeststhatcreativelydrawinguponcollaborativetoolsandmethodsenablestheintegrationbetweenphysicalandvirtualspaces.
Keywords:SocialMedia,CollaborativeLearning,LearningSpace,Socio-TechnicalSystems,ComputerLab.
1IntroductionDigitalstudentsassumeunlimitedonlineresources[1],engagewithsocialmedia,andlearnthroughcollaborativeandinformalsettings[2][3].
Theytendtomixvirtualwithphysicalspacesandneedcreativespacesinordertodeveloptheirowninnovativeandtechnologyskills.
Astoday'sworldrequiresrelianceonsocialtechnologiesandbeingconnectedtotheInternet,itisimportanttoforlearningspacestoprovidetheseonlineopportunitiesforconnectiontoaugmentthephysicalspaceswherestudentsinteract.
Theopportunitytorenovateauniversitycomputerlabforthefirsttimeinoveradecadeintoacollaborativelearningspacealsopresentedanopportunitytobuildasupportingonlinepresencebasedonsocialmediaandsocialnetworkingtools.
Thispaperdescribeshowthisvirtualenvironmentcomplementsthenewlyrenovatedphysicalspace.
Inresearchingthedesignofphysicalandvirtuallearningspaces,thesequestionsguidedthisstudy:122M.
FrydenbergWhatstrategiesmaybeemployedtotransformacomputerlabtoaphysicalandvirtualcollaborativelearningspaceHowcansocialmediaandWeb2.
0collaborationtoolscreateanonlinepresencethatwillpromotelearningbothwithinandoutsideaphysicalcomputerlaboratoryspace2FromaPhysicaltoaVirtualLearningSpace2.
1RethinkingPhysicalLearningSpacesFigure1showstheformerlabpriortorenovations.
Itisapproximately900squarefeet,housed36desktopcomputersaroundtheperimeter,andalongtableatthecenteroftheroom.
Networkingequipmentismountedonthebackwall.
Fig.
1.
BeforetheRenovationRebrandedastheCISLearningandTechnologySandbox,thenewfacilitymarksatransitionfromtheindividualizedcomputerlabwherestudentsfacethewalls,toaninformalspacewherelearningtakesplacearoundtablesorinaloungesetting.
Inengineering,"asandboxenvironmentconsistsofacontrolledsetofresourcesfortrying…newapp[lication]swithouttheriskofdamagingcriticalpartsofthesystem.
"[4]Thenewnamepromotesdiscovery,learning,andasenseofplayfulnesswithinabusinesscontext.
Theincreasingnumberofstudentswhoownlaptops,tablets,andothermobiledevices[5]pointedtotheneedtoprovidemoredeskspaceandfewerdesktopcomputers.
Therenovatedfacility,whosephysicalfootprintdidnotincrease,isshowninFigure2.
StudentsgatherinformallyinanareawithcomfortableseatingandaGoogleTV(1),engageintutoringattableswheretheycansharetheirlaptopscreensonalargemonitor(2),worktogetherondiagramsontheSMARTboard(3),projectscreensontheSMARTboardorthebackwallwhengivinginformaldemos(4),AligningOpen,Physical,andVirtualSpacesintheCISSandbox123Fig.
2.
AftertheRenovationusenetworkingequipmentoroneoftwelvedesktopcomputerswithspecializedsoftwareforCIScourses(5),andexplorenewtechnologiessuchasanearlyreleaseofWindows8onatouchscreen(6).
ThisdesignrecognizessuggestionsfromtheJointInformationSystemsCommittee[6]whichadvisesthatphysicallearningspacesbeflexible,toaccommodatebothcurrentandevolvingpedagogies;future-proof,toenablespacetobere-allocatedandreconfigured;bold,tolookbeyondtriedandtestedtechnologiesandpedagogies;creative,toenergizeandinspirelearnersandtutors;supportive,todevelopthepotentialofalllearners;andenterprising,tomakeeachspacecapableofsupportingdifferentpurposes.
SeveralofthesetraitswerealsofoundinrecentlyredesignedphysicallearningspacesatRutgersUniversity[7],UniversityofSouthCarolina[8],UniversityofMissouri[9]andotherAmericanuniversities,butnoneofthesespacesalsolaunchedwithanaccompanyingvirtualpresencetopromotelearning.
2.
2CreatingaVirtualPresencewithSocialMediaToolsTheCISSandboxisstaffedby6graduateand12undergraduatestudents,alsocalledtutorsorlabassistants,whoseresponsibilitiesbridgesupportingboththephysicalandvirtuallearningspaces.
Inthephysicalspace,theyperformmentoringandtutoring,andmonitorequipment.
Extendingtheirrolestosupportavirtualspace,theyblogregularly,createtutorialvideos,anduseweb-basedcollaborationtoolstosupportaninternalknowledgebase.
TheCISSandboxextendsbeyondaninformallearningspacelocatedinthebasementofauniversityclassroombuilding;itlivesonlineasanevolvingecosystemformedofseveralintegratedsocialnetworking,socialmediaandweb-basedcollaborationtools.
"Developingspaceswherestudentscancollaborateoutsideclassprovidessupportforanincreasedemphasisonteamwork,bothinandoutsidehighereducation.
"[10]Abedinstudiedsocialpatternsincomputersupportedcollaborativelearningenvironmentsandfoundthatnon-taskinteractionstakeplaceincomputer-supportedcollaborativelearningenvironments,oftenastheresultofinteractingwithpeersinanonlinesocialenvironment.
[11]124M.
FrydenbergSocio-technicalsystemsevolvingcomputer-basedscontent.
[12]Thesystemtechnologyandenvironmenetworksandsocialmeditechnicalsystems.
WheelerthecombinationofWebreflectivelearningspaces.
TdescribetherelationshipsbFigure3,usedinthedailyoFig.
3.
Socio-TecEachoftheonlinetoolsThepublicfaceoftheCISSeditedbystudentworkersreflectingtheirowninteresTwitterposts(3)occasionaCISSandbox,andaddaEventBriteallowsvisitorsdigitalsignagetodrawstudTutorsuseYouTube(5)explanationsrelatedtocouSkype,orinaGoogleHaprovidingvirtualsupporttophysicallocation.
Uponentering,studentsTutorscompleteanonlineOriginallythetutorformw1http://cis.
bentley.
sconsiderbothsocialandtechnicalfactorsincreatsystemsthatbenefitfromsocialmediaanduser-generaincludesthenetworkofusers,developers,informatentsinwhichitwillbeusedandsupported.
[13]Soatoolsplayasignificantroleinthecreationofsocr[14]usestheterm"learningspacemashups"torefer2.
0andsocialmediatoolstocreatecollaborativeThispaperusestheterm"socio-technicalinfrastructure"etweensocialmediaandsocialnetworkingtools,shownoperationoftheSandbox.
chnicalInfrastructureforManagingtheCISSandboxlistedpromotesthephysicalspaceoftheCISSandboxSandboxisitsWordpressblog1(2),showninFigure4.
Iswhoregularlyposthomeworktipsaswellasartictsininformationtechnology.
Facebookstatusupdatesallyreportonnewblogpostsorspecialhappeningsinsocialdimension,asstudentslikeorfollowthefaciltosignupforspecialevents.
Prezi(4)isusedtocredentsintothephysicalspace.
)tohosttheiroriginalinstructionalvideosdemonstratursetopics.
LivechatwithatutorbytextwithMeebongout(6)isavailableviaalinkfromtheSandboxblooff-campusstudentsandthosewhoareunabletovisitwhovisittheCISSandboxswipeinwiththeirIDcarformrecordingtheirtutoringactivitieswithstudentswasimplementedasaGoogleForm,andlaterreplacedwedu/sandboxtingatedtionocialcio-rtoand"tonin(1).
Itisclesandthelity.
eatetingoorlog,therds.
(7).
withAligningacustomwebapplication,wformwiththenamesofsfacultywithinformationabtypeofquestionstheyaskemoretutorsatbusierhours.
Googleapplications(8Sandbox.
AGoogleSite(wSandbox.
There,labassidocumentingtechnologyinformation.
Theyalsoshawithinthewiki,describingreportsonaninternalsitewhateachlabassistantdochronicle'sastudentworkeTutorskeeptheirhoursoallstaffautomaticallypopuGooglegroupencouragesdistributionlistisoftenusandshareinformationabouGooglegroupandthecalSandboxstafftoeasilyreviBybloggingontopicstutoringonline,andsharingextendsthereachofthephyFig.
4.
TheCISSandboxblogWiki(right)housesinstitutiona3ResearchMethoTodeterminetheeffectivenvoluntaryonlinesurveywaswhohadvisitedtheCISSanofthe608students,or23%,gOpen,Physical,andVirtualSpacesintheCISSandboxwrittenbyastudentassistant,toautomaticallypopulatestudentswhorecentlyswipedin.
Thesereportsprovboutstudentsintheirclasseswhocameforhelpanded,andprovideusagestatistics,enablingthescheduling)facilitatetheadministrativemanagementoftheCwiki),showninFigure4,istheinternalfaceoftheCistantscontributetoanevolvingknowledgebaseintheroom,policiesandprocedures,andrelaareweeklystatusreportsontheirown"miniblog"patheirworkontutoringandspecialprojects.
Sharingstaallowstheirco-workersandsupervisortostayawareoing.
Inaddition,itformsapermanentrecordthateaer'scontributionovertime.
onasharedGoogleCalendar,whosecollectivecontentulatestheschedulepageandfrontpagesidebarofblogeasycommunicationbyemailbetweenassistants.
Tedtodisseminateannouncements,askforshiftcoverautSandboxorcampushappenings.
Boththefeedfromlendarareembeddedonthefrontpageofthewikiew.
ofinteresttotheirpeers,creatinginstructionalvidegtheiractivitiesonsocialmediasites,CISSandboxsysicallearningspaceintoanonlinelearningspace.
g(left)isthepublicfaceoftheCISSandbox.
TheCISSandalknowledge,policies,andproceduresforinternaluse.
odologynessofthephysicalrenovationanditsvirtualcounterparsofferedattheendoftheFall2011semestertoallstudendboxatleastonceduringitsfirstsemesterofoperation.
respondedtothesurvey.
39%werefemale,61%male.
125thevidethegofCISCISbyatedagesatuseofasilytforg;aThisage,theforeos,staffdboxrt,aents142126M.
Frydenberg3.
1FacilityUsageSwipedatashowedthat60December2011.
Thisismsemesterayearearlierprior129studentssharedhowFig.
5Duringitsfirstsemesterblogatleastonce.
Figure6listsseveraltecrespondentswhousedthemFig.
StudentsusethesetechnWhilenearlyallofthestudor49%usethelargemonitoinstructorsofprogramming2Previouslystudentssignediofsignaturesinanotebook.
08uniquestudentsvisited2804timesfromSeptembermorethantwicethenumberofvisitsduringthesartotherenovation.
2woftentheyvisited,asshowninFigure5.
5.
FrequencyofVisitstotheCISSandbox,85ofthe126studentssurveyedsaidtheyhadvisitedchnologiesavailableintheCISSandboxandthenumbemduringtheFall2011semester.
6.
TechnologyUseintheCISSandboxnologiesforbothclassroomandextracurricularlearnientssitatthegroupstudytables,apparentlyonly69of1orsforcollaborativework.
Thismaybeduetothefacttgcoursesprohibitstudentsfromdisplayingcodeoninonpaper,sothisvalueisanestimatebasedoncountingpartoametheerofing.
142,thattheagesAligninglargescreenswhengettinghit.
StudentsgenerallyuseassignmentthattheirpeersintroductoryITcoursegiveSMARTBoard,GoogleTindependentlyexploredthebegintodeveloptheirownToattractadvancedandofferedseminarsteachingduringtheFall2011semesforMashable,aproviderpresentedaboutthecomactivities,manychampionlearningaboutbothcourse-oftenresultedincreatingbl3.
2AligningtheCISSaUsersaccesstheCISSandonlinetutoringspaces,socsectiondescribeshoweachTheSandboxBlog.
Thetherenovationsofthephysinformvisitorsabouthappetopostapproximatelytwiceforstudents,andtechnoloWindows8,thexBoxandKwaytounderstandifthesepotherstudentsvisitingthevarietyofcategoriesduringgOpen,Physical,andVirtualSpacesintheCISSandboxhelpwithhomework,sootherstudentsarenotabletocothewirelessnetworkingequipmentwhenmakingupcompletedearlierintheclassroom.
SomesectionsofeextracreditassignmentsforstudentswholearntouseTVs,orWindows8machines.
SeveralstudentassistaeMicrosoftKinectSDKtoconfiguresoftwaredemosapplications.
dinterestedstudentstotheSandbox,MicrosoftevangelstudentstocreatexBoxgamesandmobileapplicatiter.
DuringtheSpring2012semester,analumnusworkofAPIsforwebandmobileapplicationdevelopmmpany'swebservicesandcareeropportunities.
Thnedbythestudentsthemselves,createdoccasions-relatedandextracurriculartopicsintheCISSandbox,logpostsandmultimediaartifactsonline.
andbox'sPhysicalandVirtualSpacesdboxvirtualspacesviatheSandboxblog,chatroomscialnetworkingsites,andaYouTubevideochannel.
Tofthesealignswithandextendsthephysicalspace.
CISSandboxWordpressblogstartedasawaytochronsicalspaceonlineandcontinuestoevolveasawebsiteeningsaswellasablogwherelabassistantsareencouraeamonthaboutfrequentlyaskedtutoringquestions,hogyinterests.
Forexample,labassistantslearningabKinectpostedaboutthesetopics.
Unfortunately,thereispostscontributedtohigheruseofthesetechnologytoolsCISSandbox.
Figure7showsthenumberofpostsigtheblog'sfirstsixmonths.
Fig.
7.
BlogPostsbyCategory127opypanthetheantsandlistsionskingment,heseforandandThisnicleetoagedhintsboutsnosbyina128M.
FrydenbergAsnapshotfromGooglegeneratedafollowing,withitsfirstfourmonths.
ItrecefewervisitorsonweekendsFig.
8.
GooglTheblogiscurrentlyncommunicationbetweenreassigningastudentmoderchangehasbeenrequestedaOnlineTutoring.
Tutorieffective[15][16]andthcurrentlybeinginvestigatethefirstfourmonthsofosurveyedwouldfindthissecampaigngotofftoaslowTwitter,only34likedtheFduringitsfirstfourmonthssemester,sometutorsencousessionsanddistributedbusnumbersto115followerssemester,butabettersoceffectivelyusingsocialnetw4tutorscreated15instructicourseforwhichapproximSeveralofthesevideoshad3Somefacultymadethesevstudents.
eAnalyticsshowninFigure8suggeststhattheblogh51%ofreturningvisitorsand48%ofnewvisitorsdureivesonaverage100hitsperday.
Visitsarecyclical,w.
eAnalyticsreportsonnewandreturningvisitorsnotopenforreaderstocomment.
Doingsowouldfoeadersandblogauthors.
Implementingthiswouldrequratortoreviewcommentsbeforetheyareposted.
Tandisanticipatedforafuturesemester.
ingviaSkypeandscreensharinghasbeenshowntohelogisticsofimplementingthisonaregularbasisd.
Severaltutorshaveinformallyusedthesetoolsduroperation,andsurveyresultssuggested62%ofstudeerviceuseful.
SocialNetworks.
TheSandboxsocialmestart.
DespitelinksontheblogtofollowonFacebookFacebookpageand14followed@CISSandboxonTwis.
AttemptingtoimprovethesenumbersduringthespruragedstudentstofollowtheSandboxduringtheirtutorsinesscardswithsocialmediainformation.
ThisraisedsonFacebookand48onTwitterduringthefollowcialmediastrategyisrequiredtoreachstudentsmworks.
YouTubeVideos.
DuringtheSpring2011semesionalvideosonExcelconceptstaughtinanintroductorymately400studentsareenrolledacrossmultiplesectiodover200andasmanyas255views.
3Thissuggeststhavideosrequiredviewing;othersdidnotmentionthemtothasringwithsteruireThisobeareringentsediaanditterringringthewingmorester,yITons.
atattheirAligningOpen,Physical,andVirtualSpacesintheCISSandbox129leasthalfofthestudentswatchedatleastsomeofthesevideos.
StaffalsocreatedvideosofspecialeventsintheCISSandbox,and"howto"videos(suchashowtohookupalaptoptoanexternalmonitor).
AllofthesevideoswereembeddedontheSandboxblogandareavailabledirectlyfromtheCISSandboxYouTubechannel.
4ConclusionTheCISSandboxhasgrownbeyondatutoringlab,toonewherelabassistantsandstudentscanalsoexploretheirinterestsintechnologyinpersonandonline.
ForstudentsutilizingtheservicesoftheCISSandbox,learningoccurredthroughin-personandonlinetutoring,andinformallybyreadingtheSandboxblog,watchinginstructionalvideos,orattendingextracurricularworkshops.
Forthelabstaff,learningoccurrednotonlyoncoursesubjectmatterthattheywerefacedwithexplainingtotheirpeers,butalsothroughtheirowninteractionswithsocialmediatoolsthatmakeuptheSandbox'ssocio-technicalinfrastructure,andsoftwareapplicationsandtechnologiesthattheyinvestigatedaspartofspecialprojects.
85%ofthetutorssurveyedcommentedthatworkingintheCISSandboxenabledthemtolearnaboutITtrendsandconceptsbeyondwhatiscoveredintheirclasses,andthattheydevelopedbeneficialsocialmediaandtechnologyskillsthatwillhelpthemintheirfuturecareers.
Theintegrateduseofsocialmedia,socialnetworking,andweb-basedcollaborationtoolsaspartoftheCISSandbox'sday-to-dayoperationsprovidesopportunitiesforbothlabstaffanduniversitystudentstointeractwiththeseapplications,andpreparesthemtobeproductivecontributorstothebusinessworldtheyareabouttoenter.
References1.
Tapscott,D.
:GrownUpDigital:HowtheNetGenerationisChangingYourWorld.
McGrawHill,NewYork(2008)2.
Andone,D.
,Dron,J.
,Boyne,C.
,Pemberton,L.
:DigitalStudentsAcrossEurope.
In:WorldConferenceonEducationalMultimedia,Hypermedia,andTelecommunications,Florida,pp.
1741–1749(2006)3.
Atwell,G.
:PersonalLearningEnvironments-thefutureofeLearning,pp.
1–8(2007)4.
Malizia,A.
:HasEverythingBeenInventedOnSoftwareDevelopmentandtheFutureofApps.
Computer112,110–111(2011)5.
Smith,A.
:AmericansandtheirGadgets,Washington,DC(2010),http://www.
pewinternet.
org/~/media//Files/Reports/2010/PIP-Americans%20and%20their%20Gadgets.
pdf6.
JointInformationSystemsCommittee:DesigningSpacesforEffectiveLearning:Aguideto21stcenturylearningspacedesign.
In:JointInformationSystemsCommittee/Programmes/e-LearningInnovation(2006),http://www.
jisc.
ac.
uk/media/documents/publications/learningspaces.
pdf(accessedMarch2006)7.
RutgersUniversity:TheAlcove,http://alcove.
rutgers.
edu/8.
UniversityofSouthCarolina:TechnologyLoungeDedicatedatThomasCooperLibrary.
Reflections(Spring)1,3(2010)130M.
Frydenberg9.
Milne,J.
:MU'sTechnologyLoungemimicscorporateofficetrends.
ColumbiaBusinessTimes13(25)(2007)10.
Clayton-Pederson,A.
,O'Neill,N.
:CurriculaDesignedtoMeet21stCenturyExpectations.
In:EducatingtheNetGeneration,Educause,Boulder(2005),http://www.
educause.
edu/educatingthenetgen11.
Abedin,B.
:InvestigatingtheTrendofNon-TaskSocialInteractionsinOnlineCollaborativeLearningEnvironments.
In:Proceedingsofthe44thHawaiiInternationalConferenceonSystemSciences,p.
108(2011)12.
Baxter,G.
,Sommerville,I.
:Socio-technicalsystems:Fromdesignmethodstosystemengineering.
InternationalJournalofHuman-ComputerStudies,1–33(November2008)13.
Scacchi,W.
:Socio-TechnicalDesign.
In:TheEncyclopediaofHuman-ComputerInteraction,YorkshirePublishingGroup,Yorkshire(2004)14.
Wheeler,S.
:LearningSpaceMashups:CombiningWeb2.
0ToolstoCreateCollaborativeandReflectiveLearningSpaces.
FutureInternet,3–13(2009),http://www.
mdpi.
com/1999-5903/1/1/3/15.
Staupe,A.
,Kolas,L.
:Onlineinteractivelearningarenaovertheinternet.
In:ProceedingsoftheSixthConferenceonIASTEDInternationalConferenceWeb-BasedEducation,Anaheim,vol.
2,pp.
276–281(2007),http://dl.
acm.
org.
ezp.
bentley.
edu/citation.
cfmid=1323159.
1323208&coll=DL&dl=GUIDE&CFID=67263778&CFTOKEN=6022414016.
Sivula,M.
:UsingSkypeasanAcademicTool:LessonsLearned.
eLearn(7)(July2011),http://elearnmag.
acm.
org.
ezp.
bentley.
edu/archive.
cfmaid=2011843
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