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Screening Guidelines Development Process. Since 1980, the American Cancer Society (ACS) has introduced and periodically updated guidelines or guidance related to screening and or informed decision-making about tests for early detection of cancers (and, in some cases, precursor lesions) of the breast, cervix, colon and rectum, endometrium, lung.Jun 20, 2016 A-Z Guide to Screening Ore, Rock Aggregate. A simple definition of a “screen” is a machine with surface (s) used to classify materials by size. Screening is defined as “The mechanical process which accomplishes a division of particles on the basis of size and their acceptance or rejection by a screening surface”.