Between Groups vs. Within Groups

• Do participants see only one design or both?

• Between groups

  • two groups of test users
  • each group uses only 1 of the systems

• Within groups experiment

  • one group of test users
    • each person uses both systems
    • can’t use the same tasks (learning)
  • best for low-level interaction techniques

• Why is this a consideration?n

  • People often learn during the experiment.

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