What are the common ways of data collection

The common ways of data collection are questionnaire survey, access to information, field test, and experiment.

1, questionnaire survey: questionnaire survey is one of the most commonly used ways of data collection, because it is relatively low cost, and the information obtained will be more comprehensive.

2, access to information: access to information is the oldest way of data collection, by consulting books, records and other information to get the data they want.

3, field study: field study is to the designated place to do research, refers to understand the truth of a thing, the momentum of the development of the process, and go to the field to visualize, localized for detailed investigation.

4, experiments: experiments to collect data has the advantage of data accuracy is very high, and the disadvantage is that the unknown is very large, regardless of the experimental period or the results of the experiment are uncertain.