Primary Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES
      H.1.2 User/Machine Systems
          Subjects: Human factors

Additional Classification:
  D. Software
  D.2 SOFTWARE ENGINEERING

  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)
          Subjects: Interaction styles (e.g., commands, menus, forms, direct manipulation); Theory and methods

  I. Computing Methodologies
  I.6 SIMULATION AND MODELING

  K. Computing Milieux
  K.3 COMPUTERS AND EDUCATION

General Terms:
Design, Human Factors, Theory