According to your textbook, the best way to judge a theory is by its

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The textbook states that the best way to judge a theory is by its usefulness. This is because a theory that can be applied to explain a wide range of phenomena and generate new insights has practical value and can be used to make predictions or solve problems. The other options, truthfulness, concreteness, and literary value, are not necessarily the most important criteria for evaluating a theory. A theory may be true but not useful, abstract but still relevant, or well-written but lacking empirical support.

According to Your Textbook, the Best Way to Judge a Theory