As this strategy does not factor in how variables influence each other, it can only provide a description of the relationship between the two variables, rather than an explanation.

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A hallowed method, going all the way back to Pavlov and Wundt, in which only two variables are studied at once. For this method, the investigator manipulates an independent variable and then observes its effects on the dependent variable. 

Bivariate Research Strategy

Trull , T. J., &amp; Prinstein , M. J. (2013). Research Methods in Clinical Psychology . In Clinical Psychology (Eighth, pp. 93–124). Textbook, Wadsworth Cengage Learning . 

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