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The goal of providing standard definitions is to standardize the codes researchers use to catalogue the dispositions of sampled cases. This objective requires a common language, and definitions that the research industry can share.
The American Association for Public Opinion Research organization urges all practitioners to use these codes in all reports of survey methods, no matter if the project is proprietary work for private sector clients or a public, government or academic survey. This will enable researchers to find common ground on which to compare the outcome rates for different surveys.
See our Report on Standard Definitions here