Establishing trust with students is extremely important! Students will both enjoy and feel comfortable being able to share with the teacher in this way. Students may write what they need help with, what they like to learn about, etc. This is a great back-to-school activity!
To continue this theme of communication and minimize class interruptions, get the full version which includes a Top Secret Classroom Dropbox to carry on throughout the year.
Getting to Know You: Top Secret Communication Box