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

Syracuse University

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

Multivariate 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 . 

Clinical Psychology Eighth Edition 

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.  

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