Guidelines -- Step through process
4. Once the error is isolated, reason through the process start-to-finish, predicting what should be computed and then verifying that it has been
- When a prediction is inconsistent with an observation, the problem has been further isolated to the current step
- The process was OK prior to this step
- The process is incorrect after this step
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- Check the inputs and reason through the step
- If bug not found, continue applying the guidelines