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: "Estimating the relative usability of two interfaces: heuristic, formal, and empirical methods compared"
  Abstract: Two alternative user interface designs were subjected to user testing to measure user performance in a database query task. User performance was also estimated heuristically in three different ways and by use of formal GOMS modelling. The estimated values for absolute user performance had very high variability, but estimates of the relative advantage of the fastest interface were less variable. Choosing the fastest of the two designs would have a net present value more than 1,000 times the cost of getting the estimates. A software manager would make the correct choice every time in our case study if decisions were based on at least three independent estimates. User testing was 4.9 times as expensive as the cheapest heuristic method but provided better performance estimates.

Connected through hyperedge HE-1 (induced by source paper "Dogmas in the assessment of usability evaluation methods"):
  with members:
    - "COMMONALITIES AND CONTRASTS: AN INVESTIGATION OF ERP USABILITY IN A COMPARATIVE USER STUDY"

Connected through hyperedge HE-2 (induced by source paper "Usability inspection methods"):
  with members:
    - "Towards Semantic Web Portals."
    - "Evaluation metrics and methodologies for user-centered evaluation of intelligent systems"
    - "Empirical development of a heuristic evaluation methodology for shared workspace groupware"
    - "Usability and Feasibility of PmEB: A Mobile Phone Application for Monitoring Real Time Caloric Balance"
    - "Improving mobile internet usability"
    - "Revisiting heuristic evaluation methods to improve the reliability of findings."
    - "Investigating Heuristic Evaluation as a Methodology for Evaluating Pedagogical Software: An Analysis Employing Three Case Studies"

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