scanner,OSR (optical character recognition
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Moving beam scanners, this eliminates human error
the best method to collect primary data is to make a Baseline Data or using the method of Rapid Rural Appraisal.
A Keyboard; aside from avoiding uncertainty from unclear handwriting or other methods, and because "...most input data consists of letters and numbers. In addition, people are usually familiar with how to use keyboards and with the layout of the keys. Thus, little training is required for users to become familiar with keyboards" (Nickerson, pg. 75 of view-text)
no it is a primary data method
the library is the best because it is all factual the Internet can lie and make you get answers wrong.