Questionnaire
This is a designed instrument used to receive relevant information or responses from the respondent in writing. It is used by formulating relevant questions which must be geographical in nature for the respondents to answer.
Advantages
There is no risk of influencing the respondent's
answer
It is easy to administer compared to interview.
There is no risk of data collector being harassed by
respondents
Many respondents can be reached within a short time
It can be mailed or handed to respondents.
Disadvantages
It is limited by high mortality rate
Wrong information can be purposely given or information is deliberately hidden.
Faulty and ambiguous questionnaire may yield misleading information
It is expensive to administer
You may not get information immediately
It is also limited by uncooperative respondents