- Casual observation does little by itself to establish a strong base of knowledge. 
- Can lead people to erroneous conclusions. 

Syracuse University

Unsystematic observation allows us to develop hypotheses that can eventually be tested more systematically. 

Unsystematic Observation 

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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