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A questionnaire is a research instrument consisting of a series of questions and other prompts for the purpose of gathering information from respondents. Although they are often designed for statistical analysis of the responses, this is not always the case. The questionnaire was invented by Sir Francis Galton.
Questionnaires have advantages over some other types of surveys in that they are cheap, do not require as much effort from the questioner as verbal or telephone surveys, and often have standardized answers that make it simple to compile data. However, such standardized answers may frustrate users. Questionnaires are also sharply limited by the fact that respondents must be able to read the questions and respond to them. Thus, for some demographic groups conducting a survey by questionnaire may not be practical.
As a type of survey, questionnaires also have many of the same problems relating to question construction and wording that exist in other types of opinion polls.
A distinction can be made between questionnaires with questions that measure separate variables, and questionnaires with questions that are aggregated into either a scale or index. Questionnaires within the former category are commonly part of surveys, whereas questionnaires in the latter category are commonly part of tests.
Questionnaires with questions that measure separate variables, could for instance include questions on:
Questionnaires with questions that are aggregated into either a scale or index, include for instance questions that measure:
Usually, a questionnaire consists of a number of questions that the respondent has to answer in a set format. A distinction is made between open-ended and closed-ended questions. An open-ended question asks the respondent to formulate his own answer, whereas a closed-ended question has the respondent pick an answer from a given number of options. The response options for a closed-ended question should be exhaustive and mutually exclusive. Four types of response scales for closed-ended questions are distinguished:
A respondent's answer to an open-ended question is coded into a response scale afterwards. An example of an open-ended question is a question where the testee has to complete a sentence (sentence completion item).
In general, questions should flow logically from one to the next. To achieve the best response rates, questions should flow from the least sensitive to the most sensitive, from the factual and behavioural to the attitudinal, and from the more general to the more specific.
There typically is a flow that should be followed when constructing a questionnaire in regards to the order that the questions are asked. The order is as follows:
Screens are used as a screening method to find out early whether or not someone should complete the questionnaire. Warm-ups are simple to answer, help capture interest in the survey, and may not even pertain to research objectives. Transition questions are used to make different areas flow well together. Skips include questions similar to "If yes, then answer question 3. If no, then continue to question 5." Difficult questions are towards the end because the respondent is in "response mode." Also, when completing an online questionnaire, the progress bars lets the respondent know that they are almost done so they are more willing to answer more difficult questions. Classification, or demographic question should be at the end because typically they can feel like personal questions which will make respondents uncomfortable and not willing to finish survey.
Main modes of questionnaire administration are:
While questionnaires are inexpensive, quick, and easy to analyze, often the questionnaire can have more problems than benefits. For example, unlike interviews, the people conducting the research may never know if the respondent understood the question that was being asked. Also, because the questions are so specific to what the researchers are asking, the information gained can be minimal. Often, questionnaires such as the Myers-Briggs Type Indicator, give too few options to answer; respondents can answer either option but must choose only one response. Questionnaires also produce very low return rates, whether they are mail or online questionnaires. The other problem associated with return rates is that often the people that do return the questionnaire are those that have a really positive or a really negative viewpoint and want their opinion heard. The people that are most likely unbiased either way typically don't respond because it is not worth their time.
Some questionnaires have questions addressing the participants gender. Seeing someone as male or female is something we all do unconsciously, we don’t give much important to one’s sex or gender as most people mindlessly use the terms ‘sex’ and ‘gender’ interchangeably, unaware that they are not synonyms.  Gender is a term to exemplify the attributes that a society or culture constitutes as masculine or feminine. Although your sex as male or female stands at a biological fact that is identical in any culture, what that specific sex means in reference to your gender role as a ‘woman’ or ‘man’ in society varies cross culturally according to what what things are considered to be masculine or feminine. The survey question should really be what is your sex. Sex is traditionally split into two categories, which we typically don’t have control over, you were either born a girl or born a boy and that’s decided by nature.  There's also a population of the world that are Intersex which is disregarded in the North American society as a sex. Intersex refers to the group of people that don’t perfectly fall under the category or male or female. They are still a part of our community, however not many questionnaires have a box for people that fall under Intersex.  These are some small things that can be misinterpreted or ignored in questionnaires.
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