Research Article Enhancing Human-Computer Interaction in Digital Repositories through a MCDA-Based Recommender System Christos Troussas , Akrivi Krouska , and Cleo Sgouropoulou University of West Attica, Egaleo, Greece CorrespondenceshouldbeaddressedtoChristosTroussas;ctrouss@uniwa.gr Received 29 April 2021; Revised 6 September 2021; Accepted 6 October 2021; Published 19 October 2021 AcademicEditor:MarcoPorta Copyright©2021ChristosTroussasetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Digitalrepositoriescontainalargeamountofcontent,whichisavailabletoheterogeneousgroupsofpeople.Assuch,inmany casespeopleencounterdifficultiesinfindingspecificcontentwhichisrelatedtotheirpreferences.Inviewofthiscompellingneed and towards advancing human-computer interaction, this paper presents a recommender system which is incorporated in a digitalrepository.erecommendersystemisdesignedusingmultiple-criteriadecisionanalysis(MCDA)andmorespecifically theweightedsummodel(WSM)inordertorefinethedeliveredcontenttotheusers.Italsoconsidersseveralusers’characteristics (theirpreferencesasdepictedbythecontenttheyvisitedorsearchedandbythefrequencyofsearches/visits)andfeaturesofthe content (content types and traffic). e recommender system outputs the suggestions of content to users based on their preferencesandinterests.epresentedrecommendersystemwasevaluatedbyrealusers,andtheresultsshowahighdegreeof accuracy in the recommended content and satisfaction by users. 1. Introduction Human-computerinteraction(HCI)exploresthedesignand use of computer technologies, targeting the interfaces be- tweencomputersandtheirusers(people).Researchersinthe fieldofHCIstudythemeansthroughwhichpeopleinteract with computers and develop technologies that, in essence, help humans interact with them in an effective way [1, 2]. As a research topic, HCI is a confluence of computer science and several other fields of study, such as design, media studies, behavioral sciences, and so on. e term involves multiple applications for a computer, and this happens as an open-ended conversation between the user and the computer. e definition of this interconnection contrasts human-computer interaction with human-to- human interaction, a comparison that is significant for the field’s theoretical considerations. Inviewoftheabove,HCIisasignificantfieldofresearch that should be respected in the design and development of several systems and applications [3], such as digital repos- itories. A digital repository is a digital information man- agement and storage mechanism [4]. Repositories may, in their emphasis, be subject or institutional. Putting material into an institutional repository allows it to be handled and maintained by organizations and employees and hence to gainfullbenefitfromit.Study,learning,andadministrative processes may be assisted by a repository. Repositories use open practices to make sure that it is easy to access the content they contain in order to trace and recover it for further use. By using these internationally accepted prin- ciples,frameworkswhichimport,export,classify,store,and retrieve digital content within the repository can be developed. For a variety of purposes and users, digital repositories may contain a wide volume of content. Currently, what is included in a repository is less of a technical or software capacityproblemandmoreofapolicyoptiontakenbyeach organization or administrator. Study outputs, such as journalarticlesorresearchdata,e-theses,e-learningobjects, and instructional materials, and administrative data may actuallycontaincontent.Somerepositoriestakeonlycertain objects (such as theses or journal papers), whereas others aim to compile all credible research work created by the institution, constrained only by the retained rights of Hindawi Advances in Human-Computer Interaction Volume 2021, Article ID 7213246, 7 pages https://doi.org/10.1155/2021/7213246