Empirical data from only one researcher are usually not enough to validate a theory.
In order to validate a theory, we need empirical data from different researchers.
The paragraph below describes the work of Jean Piaget, who was an important exception to this rule.
The Role of Empirical Data
Jean Piaget (1896-1980) was a psychologist who formulated many new theories about child development. In order to test his theories, Piaget spent many years carefully collecting empirical data by observing and studying how children think and perceive the world around them. These empirical findings helped Piaget to convince others that his theories were correct. However, today empirical data from only one researcher are usually not enough to show that a theory is correct: Different researchers would have to conduct many similar studies and get similar results before we can say that consistent empirical data validate a theory.
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