(1) Types of Data Collection Methods
The main methods of collecting data are shown below. Some methods can be applied to collect both quantitative and qualitative data depending on the structure of questions and responses. For example, data can be quantified in a questionnaire survey with response options prepared (e.g., 80% of respondents are satisfied), whereas only qualitative data is available if it is structured with open-ended questions
In the questionnaire survey or the interview, results may easily be influenced by the way questions are formulated. Even though a questionnaire survey is conducted for the whole population, or for key respondents who may have important information, it might not be possible to obtain the necessary data as expected unless questions are appropriate and operational. Described below are some tips regarding how to prepare questionnaires and questions by different methods of data collection.
(2) Combining Different Data Collection Methods
In order to maximize the merits and minimize the demerits of each data collection method, several different methods should be combined. For example, a questionnaire survey can be conducted to complement existing data. Or, a focus group discussion among local people may be conducted to know their perception after an understanding of the general tendency has already been learned through a questionnaire survey. It is also possible to carry out a survey using both quantitative and qualitative data collection methods. It is important to consider the combination of several methods in order to reduce the biases of surveyors as well as respondents. Some examples of combining methods are described below.








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