Screening

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Screening, in general, is the investigation of a great number of something (for instance, people) looking for those with a particular problem or feature. One example is at an airport, where many bags get x-rayed to try to detect any which may contain weapons or explosives. People are also screened going through a metal detector. Even though the procedure aims at a large number of screens, it is always equivalent to sampling in statistics, because the complete population is almost always inaccessible for screening.

Screening has other, more specific meanings:

• Screening (printing), a process that represents lighter shades as tiny dots, rather than solid areas, of ink
• Electric field screening, in physics, the dampening of an electric field by mobile charges
• In atomic physics and chemistry, screening effect refers to the observation that electronic properties of atoms are better described if atoms had a lower effective nuclear charge than that would be otherwise expected from the number of protons present
• Screening (economics)
• Screening (medicine)
• Film screening, the display of a film in a movie theatre or screening room, for some special purpose such as testing or critical review

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