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12 APPENDIX DIETT Factsheet What Is DIETT? The Disruption Impact Estimating Tool--Transportation (DIETT) is an electronic analytical tool designed to assist transporta- tion, security, and emergency-preparedness planners as they identify and prioritize potential high-value transportation choke points (TCPs) such as bridges, tunnels, and passes. These high-value TCPs are predominantly located along major commercial trans- portation routes, and a key area of concern is how disruptive events may affect the flow of commercial shipments through TCPs. DIETT calculates the direct transportation and economic impacts (costs) of an event that precludes the use of a TCP, and it prior- itizes on these transportation assets on the basis of economic criteria. DIETT does not calculate replacement costs. Decision mak- ers can use DIETT's prioritized sets of outputs, along with other risk information, to better focus their capital resources, security, and emergency-preparedness planning. Who Can Benefit from Using DIETT? Although DIETT is specifically designed to assist state departments of transportation and other state security and emergency- preparedness organizations, prioritized state results can be readily merged to identify candidate TCPs for use in regional or national prioritization schemes. Localities and metropolitan areas can also work with area-specific data to assess their TCP priorities. Although DIETT is designed to prioritize on the basis of direct transportation and economic impacts, it can be expanded by adding other criteria of interest to the user and thus can be applied in numerous applications. A generalized schematic of DIETT is pro- vided in Exhibit 1. How Does DIETT Work? DIETT is an auto-executable program that employs commonly used software and user-supplied data to generate a prioritized list of TCPs. It is composed of two interconnected off-the-shelf programs and a set of specified and unspecified optional pro- grams. The off-the-shelf programs are Microsoft (MS) Access and MS Excel. MS Access is used to select the first-tier candidate TCPs from user-supplied databases and to connect to MS Excel. MS Excel is used for modeling transportation and economic impacts and for generating the input and output presentation mod- ule. Interim scenario development and final prioritizations are also performed in MS Excel. All of the MS Excel modeling and presentation features are preprogrammed. The MS Excel part of DIETT is structured to calculate the transportation-related and the economic-related impacts (costs) and to facilitate the development of alternate scenarios. Automatic sort functions are included to allow for ease of prioritization. Although DIETT is packaged on its own and can run on its own, in order to fine-tune the prioritizations developed in DIETT, it is recommended that DIETT reside in the Consequences Assessment Tool Set-Joint Assessment of Catastrophic Events (CATS- JACE). CATS-JACE, a configuration of CATS, is a consequence management package that integrates hazard prediction, conse- quence assessment, emergency management tools (including the Hazard Prediction and Assessment Capability [HPAC] system) and critical population and infrastructure data within a commercial geographical information system. CATS-JACE is available to state agencies and contains ArcGIS (version 9.0), which can be used to refine the detour lengths specified in the base data (e.g., National

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13 Exhibit 1. Generalized schematic of DIETT. Bridge Inventory [NBI]). The Defense Threat Reduction Agency (DTRA) and the Federal Emergency Management Agency (FEMA) developed CATS-JACE to support emergency managers' training, exercises, contingency planning, and logistical planning, and to cal- culate requirements for humanitarian aid and force protection. For more information on CATS-JACE, see DTRA provides CATS-JACE software and training; please see Detailed installation and operating instructions for DIETT are provided in Part 2 of NCHRP Report 525, Volume 11. For security reasons, data used to illustrate the use of DIETT were altered NBI data from different U.S. states entered as the data of an imaginary state--Fredonia. SECURITY CAUTION When DIETT is used with actual data, the results could not only help users with legitimate purposes, but also those intending to disrupt the U.S. transportation infrastructure. Therefore, DIETT outputs should be guarded, and access should be limited to those with a "need to know."