This page is under development. Below are some links to help you get started.

• Data Quality Assessment - Before existing data can be used, it will need to be assessed against its intended use.  
• Chapter 3 of the Guidance for Quality Assurance Project Plans (G-5) identifies elements to consider when planning projects that use existing data.  
• Checklist for Quality Concerns - Draft checklist and list of resources for evaluating secondary data.  
• EPA's Science Policy Council Assessment Factors - General Assessment Factors for Evaluating the Quality of Scientific and Technical Information  
• Software - For links to free software for performing data quality assessment, see Quality-Related Resources - Software. EPA has a site license for SAS for EPA employees - for information, see EPA SAS Support Home Page.