In which phase of troubleshooting do you confirm the steps required to reproduce the error or symptom?

The correct phase of troubleshooting in which you confirm the steps required to reproduce the error or symptom is the phase of defining the issue. During this phase, it's essential to clearly articulate what the problem is and to gather all relevant information about the system behavior and symptoms. By confirming how to reproduce the error, you not only ensure that you have a clear understanding of the issue but also enable consistent testing and validation of any potential fixes. Defining the issue sets the stage for the subsequent steps in troubleshooting, allowing for a more structured approach to resolving the problem.

In contrast, identifying the symptoms involves observing and documenting the behavior of the system without necessarily confirming reproduction steps. Establishing a plan comes after the issue has been defined, focusing on how to resolve it. Evaluating the outcome is the phase where the effectiveness of the applied solution is assessed, which occurs after the issue has been addressed. Thus, defining the issue is crucial for accurate troubleshooting and leads to a more effective resolution strategy.