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: "Item's Characterization for Model's Development in Information Retrieval System Evaluation"
  Abstract: The purpose of this paper is to introduce the concept of Item’s Characterization (IC) in the search for usable measures for use at the user-centered level of the evaluation of IR systems. However, after identifying items for use to assess measures either to evaluate the system or propose them for use in the system’s evaluation as done in this study, it is appropriate to adequately characterize the items using the right method. The survey and Factor Analytic (FA) methods were used in this experiment. Results obtained from the experiment underscored the robustness of the concept of IC as well as the FA method used. It also showed that both IC and FA will impact on the process of IR system evaluation especially from user’s perspective. But a larger sample size and a parallel method of data collection are required for future study, in order to further confirm the model’s validity.

Connected through hyperedge HE-1 (induced by source paper "The measurement of user satisfaction with question answering systems"):
  with members:
    - "Measuring user satisfaction with knowledge management systems: scale development, purification, and initial test"

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