Choosing between methods: analysing the user's decision space in terms of schemas and linear models

ABSTRACT

We offer an account of how users choose between alternative methods which take different times to accomplish the same task. Users offered a choice between two methods do not necessarily pick the faster. We argue that users reduce the complexity of the decision space by applying a 'simple compensation schema' acquired from everyday experience. Linear models of performance time enable us to predict how users will view the situation in terms of this schema, and how accurate assessment of the optimal choices within the schema-based assimilations can result in an apparent bias in favour of one method.

REFERENCES

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• 4: MacLean, A., Barnard, P. & Wilson, M. Evaluating the human interface of a data entry system: User choice and performance measures yield different tradeoff functions. In P. Johnson & S. Cook (eds} People and Computers: Designing the Interface. Cambridge University Press, 1985
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INDEX TERMS

Primary Classification:
  K. Computing Milieux
  K.6 MANAGEMENT OF COMPUTING AND INFORMATION SYSTEMS
      K.6.1 Project and People Management
          Subjects: Management techniques (e.g., PERT/CPM)

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

  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.6 Methodology and Techniques
          Subjects: Interaction techniques

  K. Computing Milieux
  K.6 MANAGEMENT OF COMPUTING AND INFORMATION SYSTEMS
      K.6.2 Installation Management
          Subjects: Performance and usage measurement

General Terms:
Design, Human Factors, Management, Measurement, Performance, Theory