DEVELOPMENT PLAN FOR THE CAUSAL ANALYSIS / DIAGNOSIS DECISION INFORMATION SYSTEM (CADDIS) 2001-2004
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Project Start Date03/29/2001
Project Completion Date (Actual/Projected)01/30/2004
Increasingly, the regulatory, remedial, and restoration actions taken to manage impaired environments are based on measurement and analysis of the biotic community. When an aquatic assemblage has been identified as impaired, an accurate and defensible assessment of the cause can help ensure that appropriate actions are taken.
The U.S. EPA's Stressor Identification Guidance describes a methodology for identifying the most likely causes of observed impairments in aquatic systems. Stressor identification requires extensive knowledge of the mechanisms, symptoms, and stressor-response relationships for various specific stressors as well as the ability to use that knowledge in a formal method for causal analysis.
The development plan attached below describes a strategy for developing the Causal Analysis/Diagnosis Decision Information System (CADDIS). The CADDIS system is envisioned as a decision support application that will help investigators in EPA Regions, states, and tribes find, access, organize, and share information useful for causal evaluations in aquatic systems.
CADDIS will include supporting case studies and analysis tools, and it will provide access to databases that contain information useful for causal evaluations. The system will be developed incrementally and iteratively with frequent user input and feedback essential to the system's success.
The first version, CADDIS I, leads the user through the process, explains the steps, provides worksheets for completing the steps and illustrates each step using examples from a real case study. CADDIS I was released at the end of CY05.
In 2006, work had begun on CADDIS II, to provide more technical support including a conceptual model library, exposure-response information for common stressors, statistical tools for analyzing state monitoring data and links to data bases. CADDIS II is an ORD-wide effort, which will be completed in 2007.
CADDIS III, which is scheduled for 2009, will contain additional technical support and connectivity to resources that will help users determine the causes of biological impairments.