This is a common approach in the study of child and adolescent psychopathology. Researchers may use questionnaire data, life records, observation, and so on. Such data can be correlated and factor analyzed.  

Purpose of Multivariate Research Strategy 

This method, like other correlational approaches, has its limitations: 
- Cost
- Time
- Access to participants

Disadvantages of Multivariate Research Strategy 

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

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

Traditional Experimental Strategies

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 

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. 

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