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: "Revisiting heuristic evaluation methods to improve the reliability of findings."
  Abstract: The heuristic evaluation (HE) method is one of the most common in the suite of tools for usability evaluations because it is a fast, inexpensive and resource-efficient process in relation to the many usability issues it generates. The method emphasizes completely independent initial expert evaluations. Inter-rater reliability and agreement coefficients are not calculated. The variability across evaluators, even dual domain experts, can be significant as is seen in the case study here. The implications of this wide variability mean that results are unique to each HE, results are not readily reproducible and HE research on usability is not yet creating a uniform body of knowledge. We offer recommendations to improve the science by incorporating selected techniques from qualitative research: calculating inter-rater reliability and agreement scores, creating a codebook to define concepts/categories and offering crucial information about raters' backgrounds, agreement techniques and the evaluation setting.

Connected through hyperedge HE-1 (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"
    - "Estimating the relative usability of two interfaces: heuristic, formal, and empirical methods compared"
    - "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