Dr. Gary Brown's Autism/DTT Letters app uses Discrete Trial Training (DTT) to help your child learn the letters of the alphabet (A-Z) and to learn the difference between uppercase and lowercase letters. The letters can be viewed in a simple sans-serif font, serif font, handwritten print font, a cursive font and with several other new card sets. The app also includes the letters in American Sign Language. This app has been tested extensively in Dr. Brown's clinic with children who have autism, ADHD, and other developmental disorders.


