The books in this series aim to help primary school students practice spelling, alphabetical order, and the use of a dictionary. The young students copy many times in these books and learn spelling and the basic vocabulary of each school subject, as well as supplementary words and sentences composed of selected, familiar letters to the child.

The Index is particularly useful as children practice correct spelling and alphabetical order of new words they learn or those that present spelling difficulties.

This is a small dictionary that the student is called to create themselves, and this is of particular importance to them because it gives them the joy of creation and self-motivation.