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: "Exploring participation in the design of public library e-services"
  Abstract: Public libraries are in crisis-mode trying to figure out their future. One area they are struggling with is their role and relationship to the Internet -- their e-services. This study engages public library staff, vendors and members in the redesign of online account management features as a way to look at participation from the perspective of the participants. Bringing together concerns, ideas and methodologies from the fields of librarianship, education, and Participatory Design, this study uses a Participatory Action Research approach to explore what we mean by participation and to identify barriers to achieving our ideal vision of participation.

Connected through hyperedge HE-1 (induced by source paper "Participatory design of public library e-services"):
  with members:
    (none)

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: Engineering