human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Usability inspection methods"
  Abstract: Usability inspection is the generic name for a set of costeffective ways of evaluating user interfaces to find usability problems. They are fairly informal methods and easy to use.

Connected through hyperedge HE-1 (induced by source paper "Revisiting heuristic evaluation methods to improve the reliability of findings."):
  with members:
    (none)

Connected through hyperedge HE-2 (induced by source paper "Improving mobile internet usability"):
  with members:
    - "A survey of what customers want in a cell phone design"
    - "Wireless Technology Diffusion: An Evaluation Model for Wireless Services"

Connected through hyperedge HE-3 (induced by source paper "Estimating the relative usability of two interfaces: heuristic, formal, and empirical methods compared"):
  with members:
    - "Dogmas in the assessment of usability evaluation methods"

Connected through hyperedge HE-4 (induced by source paper "Empirical development of a heuristic evaluation methodology for shared workspace groupware"):
  with members:
    - "How people use orientation on tables: comprehension, coordination and communication"

Connected through hyperedge HE-5 (induced by source paper "Evaluation metrics and methodologies for user-centered evaluation of intelligent systems"):
  with members:
    - "Applying SCORE to field-based performance evaluations of soldier worn sensor technologies"

Connected through hyperedge HE-6 (induced by source paper "Usability and Feasibility of PmEB: A Mobile Phone Application for Monitoring Real Time Caloric Balance"):
  with members:
    - "Deconstructing gamification: evaluating the effectiveness of continuous measurement, virtual rewards, and social comparison for promoting physical activity"

Connected through hyperedge HE-7 (induced by source paper "Towards Semantic Web Portals."):
  with members:
    - "Ontology versioning on the semantic web"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science