They are an unreliable means of gathering the primary data in many foreign countries because of low literacy rates.
Literacy is defined in its broadest sense as "certain ways of thinking about and performing reading and writing" with the aim of comprehending or communicating ideas in writing in a given context. In other words, individuals in literate societies have a set of habits for creating and reading written material, as well as attitudes toward these habits. According to this perspective, writing is always done for a specific audience, while reading is always done for a certain purpose. Over the course of a person's lifetime, literacy instruction, learning, and practice are always influenced by one's beliefs about reading, writing, and their importance to both society and the individual. According to some researchers, there have been two distinct periods of interest in the concept of "literacy" throughout history.
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