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With the application of probability sampling in the 1930s, surveys became a standard tool for empirical research in social sciences, marketing, and official statistics.

The methods involved in survey data collection are any of a number of ways in which data can be collected for a statistical survey.

These are methods that are used to collect information from a sample of individuals in a systematic way.

First there was the change from traditional paper-and-pencil interviewing (PAPI) to computer-assisted interviewing (CAI).

Now, face-to-face surveys (CAPI), telephone surveys (CATI), and mail surveys (CASI, CSAQ) are increasingly replaced by web surveys.

In research of human subjects, a survey is a list of questions aimed at extracting specific data from a particular group of people.

Surveys may be conducted by phone, mail, via the internet, and sometimes face-to-face on busy street corners or in malls.

Surveys are used to increase knowledge in fields such as social research and demography.

Free software, freedom-respecting software, or software libre is computer software distributed under terms that allow the software users to run the software for any purpose as well as to study, change, and distribute the software and any adapted versions.

Free software is a matter of liberty, not price: users, individually or collectively, are free to do what they want with it, including the freedom to redistribute the software free of charge, or to sell it, or charge for related services such as support or warranty for profit.