The current study employed a mixed method analysis to examine various hypotheses related to the notion of selfishness, as well to investigate the selfishness or selfism-related behaviours. A total of 179 adults participants undertook a survey including a total of 66 questions. It has been found no significant difference in levels of selfishness between genders or groups of internal and external locus of control. Furthermore, no significant correlation has been found between age and levels of selfishness. A significance model was revealed in the case of the fourth hypothesis, which found a cumulatively effect of locus of control, social support and religiousness commitment upon selfishness, with only the last variable presenting real significance. These finding were somewhat inconsistent with previous research. On the other hand the qualitative analysis supported the previous findings, mainly categorising selfishness related behaviours into negative behaviours, positive behaviours and emotional instability. Findings call for further research in order to better understand the phenomenon and develop real life applications.