Questions: A user reports that her system is running slowly when saving files. You determine that you'll need to upgrade her hard disk. You identify the components that are required and schedule the repair for later that afternoon. Which of the following steps have you forgotten in your troubleshooting process? Create an action plan. Verify system functionality. Perform a backup. Implement the solution.

The answer is: Perform a backup.

Explanation for each option:

1. Create an action plan: This step involves planning the steps needed to resolve the issue, which you have done by identifying the components required and scheduling the repair.

2. Verify system functionality: This step is typically done after implementing the solution to ensure that the issue has been resolved and the system is functioning correctly. Since you haven't yet performed the repair, this step is not applicable at this stage.

3. Perform a backup: Before making any hardware changes, it is crucial to back up the user's data to prevent data loss. This step appears to be missing in your troubleshooting process.

4. Implement the solution: This step involves actually performing the repair, which you have scheduled for later that afternoon.

Summary: In your troubleshooting process, you have forgotten to perform a backup, which is a critical step to ensure that the user's data is not lost during the hard disk upgrade.