The objective of the present research is to put forth a theoretical model that measures information systems security effectiveness in minimizing security breaches. Very few studies were undertaken in this area. The model includes a number of literature-supported constructs. A number of hypotheses based on the influence of these constructs on IS security effectiveness are presented. These hypotheses are grounded using the appropriate literature. In the next phase of the study, we intend to revise and empirically validate the model using a pilot study utilizing a number of practitioners from Brazil, Finland, and the United States. The data obtained from the pilot study will be used to make improvements on the initial instrument designed for the study. In the third stage of the research a large sample of data will be collected from the aforementioned countries and a regression analysis will be conducted on the data to investigate which constructs influence IS security effectiveness.