Can be true because it sometimes involves the questions that often confuse between the answer.
sometimes there is no question from the title you want to do with the question by the researcher. There it will then confuse the answer and the result is not satisfactory decision belongs to all.
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Quality Assurance Surveillance Plan (QASP)
give a survey
Yes, The data collected in a survey is a primary source, and conclusions based on that data would be a secondary source.
The United States Geological Survey
Survey.