U4d1 discussion post min. 400 words

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two approaches or models of validity—trinitarian and unitary. In some ways, these two models are competing views of gathering evidence for a test’s validity. In other ways, the two approaches have an overlap of elements.

For this discussion:

  • Compare and contrast these two models in terms of how they conceptualize validity.
  • Identify at least one advantage and disadvantage of each model.
  • Decide which model appears to be the most valid for determining validity of a test.
  • Explain your decision in terms of the implications for decision making about a test’s validity.

Be sure to include citations from Guion’s 1980 article, “On Trinitarian Doctrines of Validity,” and Messick’s 1995 article, “Validity of Psychological Assessment: Validation of Inferences From Persons’ Responses and Performances As Scientific Inquiry Into Score Meaning.”