Psychology follows the scientific method
Psychology follows the same steps to obtaining conclusions as in any scientific field. Therefore it is, by definition, a science.
          
            
            
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          The Argument
Hard sciences use the scientific method to draw conclusions about the natural world. The scientific method involves observing, measuring, gathering data, testing hypotheses, experimenting, and developing theories.[1] Psychology employs every facet of the scientific method, and must be considered a hard science.
        Counter arguments
Simply using the scientific method does not make psychology a science. Science observes concrete cause and effect processes which reveal truths about how the world works.[1] Psychology relies on observing human behaviors which are unpredictable, yielding conclusions which are abstract at best.
          Proponents
Premises
[P1] Psychology is a science because it employs the scientific method.
        Rejecting the premises
[Rejecting P1] Using the scientific method alone isn't enough to classify something as a science.