Dr. Will Thalheimer of Work-Learning Research examines this topic in detail.
The paper addresses such as questions as:

• Is feedback always helpful?
• How much information should be provided as feedback?
• What kind of information should be provided as feedback?
• How should feedback be provided on correct answers?
• How should feedback be provided on incorrect answers?

This paper offers perspective on the place of feedback in learning, makes recommendations for practice and explains the research that supports them.