In this method you collect the data yourself using methods such as interviews and questionnaire. In this method of data collection, your work is unique and no one has access to publish the same. Under this method, there are several types include:
Data collected using the above methods may be quantitative in nature or qualitative. Information collected through Quantitative data are quantifiable. Example consumption of petrol and diesel in India. In the case of qualitative data, that cannot be expressed in standard units of measurements this is because they are features, or qualities.