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Employment Projections (EP) is fundamentally different from most BLS programs because it is not a survey program. Instead, EP is a model-based program that makes long-term projections of industry and occupational employment using standard and accepted economic theory and econometric techniques involving a wide variety of economic data. In cases where multiple models are assessed, EP staff make selections based upon widely accepted econometric diagnostics and practices. In addition, there are several important assumptions and data limitations that are key to properly understanding and using EP data. For an in-depth discussion of these assumptions and limitations as well as the model framework, please see the Concepts and Calculation sections.