Which of the following is NOT one of the four levels of feedback according to Hattie and Timperley (2007)? a) Self-regulation level b) Emotional Level c) Process Level

The question asks to identify which of the given options is not one of the four levels at which feedback can operate.

The four levels of feedback, as described by Hattie and Timperley (2007), are:

1. Task Level: Feedback about the correctness of the task performance or product.
2. Process Level: Feedback about the processes or strategies used to perform the task.
3. Self-regulation Level: Feedback about the student's capacity to monitor their own learning, effort, and strategies.
4. Self Level: Feedback about the student as a person (e.g., "You are a smart student"). This level is generally considered less effective.

Let's evaluate the given options:

• a) Self-regulation level: This is one of the four recognized levels of feedback.
• b) Emotional Level: This is not one of the four recognized levels of feedback. While emotions can influence how feedback is received, "Emotional Level" is not a distinct category in the established framework.
• c) Process Level: This is one of the four recognized levels of feedback.

Therefore, the "Emotional Level" is not one of the four levels at which feedback can operate.

The final answer is $\boxed{\text{Emotional Level}}$