World of Sociology , 2001 . Lahey (2004 ) pointed out that the definition of psychology is composed of three words - science , behavior and mental processes . Psychology is considered to be a science because psychologists attempt to understand people through careful , controlled observation . This reliance on rigorous scientific methods of observation is the basis of all sciences , including psychology . The term behavior refers to all of a person 's overt actions that others can directly observe . When you walk , speak or show a...











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