Many governments and agencies now seriously worry about terrorism as a result of the attacks on the World Trade Center in the United States. As professional explosive blast consultants, we can't help but notice how frequently the media covers terrorist acts around the globe, sometimes with tragic results. Even though buildings are among an organization's most valuable assets, many of them are still built today in accordance with pertinent building rules without any architectural features that would lessen the effects of an explosive blast. The traditional table & chart method, which uses a set of heuristics that the user can use to estimate the blast impacts, is one strategy for enhancing a building's protective characteristics. Utilizing simulation and modelling is a second approach.