Positive feedback should have contingent, descriptive praise. 

• “Good Job”, “Nice work” is not enough.
• Provide specific examples of what was done correctly.  “Great job delivering the stimulus at the correct time.”

Corrective feedback

• Provide an empathy statement
• Describe ineffective performance
• Provide a rationale for desired change in performance
• Provide instructions and demonstration for how to improve designated performance
• Provide opportunities to practice the desired performance
• Provide immediate feedback
• Follow-up
• •  

You can provide feedback in many different ways:

• •  Visual
  •  Written
  • Modeled
  • Video
  • Graphic
  • Self-monitored
  • Formal (e.g., in scheduled situations such as pre-arranged meetings)
  • Informal (e.g., ongoing, on-the-job