human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "a comprehensive model of usability"
  Abstract: Usability is a key quality attribute of successful software systems. Unfortunately, there is no common understanding of the factors influencing usability and their interrelations. Hence, the lack of a comprehensive basis for designing, analyzing, and improving user interfaces. This paper proposes a 2-dimensional model of usability that associates system properties with the activities carried out by the user. By separating activities and properties, sound quality criteria can be identified, thus facilitating statements concerning their interdependencies. This model is based on a tested quality meta-model that fosters preciseness and completeness. A case study demonstrates the manner by which such a model aids in revealing contradictions and omissions in existing usability standards. Furthermore, the model serves as a central and structured knowledge base for the entire quality assurance process, e.g. the automatic generation of guideline documents.

Connected through hyperedge HE-1 (induced by source paper "the use of application scanners in software product quality assessment"):
  with members:
    - "a bayesian network approach to assess and predict software quality using activity based quality models"
    - "a bayesian network approach to assess and predict software quality using activity based quality models"
    - "tool support for continuous quality control"
    - "an activity based quality model for maintainability"

Connected through hyperedge HE-2 (induced by source paper "a bayesian network approach to assess and predict software quality using activity based quality models"):
  with members:
    - "a bayesian network approach to assess and predict software quality using activity based quality models"
    - "tool support for continuous quality control"
    - "an activity based quality model for maintainability"
    - "a literature survey of the quality economics of defect detection techniques"

Connected through hyperedge HE-3 (induced by source paper "a bayesian network approach to assess and predict software quality using activity based quality models"):
  with members:
    - "a bayesian network approach to assess and predict software quality using activity based quality models"
    - "tool support for continuous quality control"
    - "an activity based quality model for maintainability"
    - "a literature survey of the quality economics of defect detection techniques"

Connected through hyperedge HE-4 (induced by source paper "managing quality requirements using activity based quality models"):
  with members:
    - "an activity based quality model for maintainability"
    - "a literature survey of the quality economics of defect detection techniques"

Connected through hyperedge HE-5 (induced by source paper "an activity based quality model for maintainability"):
  with members:
    - "one evaluation of model based testing and its automation"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.HC(Human-Computer Interaction)