* Learning Disorder: Problems that affects the children's ability in recibe, processing, analyze and accumulate information. These causes difficulties in math calculation, read, write, spelling and orthography.

* Dysorthography (Dyslexia Dysgraphia): Language specific disorder of writing, is the combination of mistakes affects the word and no the outline or orthography.

* Phonology: Part of linguistics that studies the phonemes and theoretical descriptions about vocalic sounds and consonants that form a language.