In the blackbox model of information processing, which statement is true?

• A. The decision-making process is observable.
• B. Only the input is observable.
• C. Input and output are observable, but the decision-making process is speculative.
• D. Nothing about input is observable.

Answer: (C)

In the blackbox model, you can observe what goes in (input) and what comes out (output), but you can’t directly observe the internal decision-making steps. Those internal processes are inferred from how the input maps to the output, which is why the decision-making is described as speculative. That makes the statement that input and output are observable, while the internal decision-making is not directly observable, the correct interpretation.

The other ideas don’t fit because the model does not make internal thinking observable, it does not limit observation to input only, and it assumes input is observable, which it is.