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 4. Schedule: Similar to the questionnaire that contains the questions pertaining to the matter of

investigation is known as the schedule.

5. Other Methods: Apart from the above methods of collecting primary data there are some

other methods through which we can collect the data. For example, the data about the

properties of soil and water are collected directly in the field by measuring their characteristics

using soil and water quality kit; similarly, field scientists collect data about the health of the

crops and vegetation using different kinds of sensors. 

(B) Secondary Data

Data collected from any published or unpublished sources are called Secondary data. In

secondary data, people do not go directly into the field for collecting the information rather

than they are dependent on primary data which is already been published or unpublished

Example – Government publications (Census of India) books, journals, etc