Today I would like to give an overview, both of the meeting program in general and, more specifically, on the work that is being done in the ARPA/ AFML Program for Quantitative Flaw Definition. I will first briefly define the philosophy of quantitative flaw definition. I will then discuss, in a general way, some different approaches that are being used to obtain the necessary information. Finally, I will present a specific outline of the. technical structure of the ARPA/AFML program. This will provide a framework to which the talks presented during the day can be related.