End user acceptable/unacceptable behavior related to computer information systems has caused significant losses to business and society. Some measures have been suggested to prevent losses or discourage unethical behavior. One approach is to identify factors that might better explain acceptable/unacceptable actions. In this study, we examined models of ethical behavior and selected factors from these models that might influence decision-making. We conducted an empirical study to determine perceptions of acceptable or unacceptable behavior and which factors were significant in influencing a person’s judgment of acceptable/unacceptable behavior. Identifying the factors that influence ethical decision-making is one approach suggested by researchers to find ways to discourage unethical behavior and help businesses prevent losses. The results of the study indicate there are significant factors that affected individuals’ assessment of what is acceptable behavior. The results also indicate that the factors which were influential were contingent on the characteristics of the ethical dilemma.