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

For this method, researchers focus on naturally occurring phenomena and deal with numerous variables simultaneously. 

Multivariate Research Strategy 

Relational research strategies which are historically significant in experimental psychology. 
- Bivariate 
- Multivariate

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Utilized to determine cause-effect relationships among events. 

Experimental Method 

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

Clinical Psychology Eighth Edition 

- Control Group
- Experimental Group
- Independent Variables
- Dependent Variables
- Participants must be assigned randomly to experimental and control groups.
- Between and Within-Group Designs
- Internal Validity
- External Validity
- Analog Research

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