- Source: pxhere

A questionnaire is a research instrument consisting of a series of questions for the purpose of gathering information from respondents. The advantages of using a questionnaire are that it is relatively inexpensive, it does not require as much effort from the questioner as verbal or telephone surveys, and the use of standardised answers makes it simple to compile data. However, because respondents must be able to read the questions and respond to them in writing, this method may be inappropriate for some demographic groups.