The Frenchman Descartes described common sense like this: Common sense is, of all things among men, the most equally distributed... And in this it is not probable that everyone is wrong: conviction is to be considered rather as a testimony than the faculty of judging well and of distinguishing Truth from Error, which is properly what is called Good Sense or Reason... but only from that, which we conduct our thoughts in different ways, and we do not fix our attention on the same objects. Because possessing a vigorous mind is not enough; the first requirement is to apply it correctly. (Veitch, 1901, p. 149). This corresponds to the meaning of common sense in the modern context as the Cambridge Advanced Learner's Dictionary defines it as "the basic level of practical knowledge and judgment that we all need to help us live in a reasonable and safe way in the world" (p. 242) .However, the practical knowledge and judgment involved can be questionable at times as they are not entirely correct and that is when psychology comes into practice. The American Psychological Association [APA] (2014) defines psychology as “the study of mind and behavior[sic]”, which includes all aspects of human experience (par. 1). This study of mind and behavior is scientific in nature and people who work in this field are called psychologists interested in studying overt behaviors (actions and responses that can be directly observed), but are particularly interested in studying covert behaviors which are internal processes that cannot be directly observed (Jackson, 2008). This essay will elaborate on how psychology is not just common sense, demonstrating how psychology-related methods and common sense reasoning differ in terms of thought process...... half of the article ......nods , E., Speizer, F., Willett, W., & Colditz, G. (2002). Prospective study of fruit and vegetable consumption and lung cancer risk among men and women. Journal of the National Cancer Institute, 92, 1812-1823. Erikson, E. H. (1963). Childhood and society. New York: W. W. Norton & Company. Bernath, M. S. & Feshback, N. D. (1995). Children's trust: Theory, assessment, development, and research directions. Applied and Preventive Psychology, 4, 1-19.Harris, P. L. (2007). Trust. Developmental Sciences, 10, 135-138.Bowlby, J. (1969). Attachment and Loss: Vol. 1. Attachment. New York: Basic Books. New York: Basic Books. Erikson, E. H. (1963). Childhood and society (2nd ed.). New York: W. W. Norton & Company. Corriveau, K., & Harris, P. L. (2010). Young children's trust in what others say. Interpersonal trust during childhood and adolescence, 88.