The revised edition of "The Sorcerer's Apprentice 3 SAS" offers new elements to support children on their way to secure spelling: - Conscious reflection on the work done through the double box in the footer of each page: In the case of error-free work, the teacher enters a form of confirmation in the left box. If the child has made mistakes on the page, the teacher records the number of errors in the left box, while the child notes the number of errors they have found in the right box. When marking the errors, the teacher can take a differentiated approach: for more capable students, she can mark the error in the margin, while for less capable children, she can mark it directly after the word. The child can then correct the error using their favorite color. The symbol of the double box is explained in the front flap.