Disadvantages
This method of interviewing takes a long time and might be expensive than other data collection methods.
The interviewed person is more likely to refuse answering the question or they might lie if they give an answer.
Questionnaires can also include:
yes or no answers
ticking boxes
numbered responses
word responses
questions which require a sentence to be written
Whichever style of question is used, it is important that they are easy to understand, cover every possible answer, are unbiased and unambiguous. It is also important that you ensure that they are appropriate to your survey.
It is important that a question is easy to read so that the person answering the question can understand what it means which will help them to give the right answer. Covering every possible answer is also important so that they can answer the question properly rather than lying or guessing. Making sure the question is unbiased is also important so that it is not misleading or favouring one particular thing.
How a question is phrased is very important so that it is not favouring one thing in particular or it is harder for the answerer to understand the question.
examples of questions which is bad and is not phrased properly are:
You support Manchester united, don't you. This is a biased question because it is favouring and trying to persuade you to say Manchester united. A better question would be which football team, if any, do you support?
Are you a criminal? This is not a good question because It is unlikely that you will get a truthful answer to this, especially in a face-to-face interview.
Do you think maths is a very interesting subject or quite an interesting subject? This is biased in favour of maths, and it does not cover every possible answer.
The purpose of collecting data is to obtain information to keep on record, to make decisions about important issues or to pass information on to others. Data is primarily collected to provide information regarding a specific topic. There are two ways data can be collected. One way is primary collection and the other is secondarily collecting. Primarily collecting data is when you collect data yourself to get the information that is needed. Secondarily collected data is when you get data which has been collected by someone else in the past and you use it as your data.
The advantage and disadvantage of collecting data primarily is that you can get the specific data you need but this method takes a long time. The advantage of collecting data secondarily is that it is quicker to get the data rather than collecting yourself but the disadvantage is that you cannot get the specific data that you need.