In which approach is the focus of the researcher on one particular trait, such as need for cognition, rather than on a combination of traits?

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The single-trait approach is a research approach that focuses on one particular trait, such as need for cognition, rather than on a combination of traits. The unidimensional approach is similar but refers to assessing the levels of one specific trait. The multidimensional approach and the multiple-trait approach both consider a combination of traits in their research designs. The uni-trait approach is not a recognized approach to personality research.

In Which Approach Is the Focus of the Researcher on One