What is the most important factor in an English language learner's development of writing skills in English?

The most important factor in an English language learner's development of writing skills in English is the student's level of literacy development in the home language. This is crucial because a strong foundation in the home language contributes significantly to the acquisition of writing skills in a new language. Literacy skills, such as understanding the structure of language, grammar, and composition, can be transferred from the home language to English. A student who is literate in their native language is likely to have a better grasp of fundamental writing concepts, which facilitates the learning process in a second language.

The ability to read and write in a first language enhances cognitive skills that are essential for writing in English, such as critical thinking and the ability to organize thoughts coherently. Furthermore, students with strong literacy skills in their home language can leverage these skills when learning the conventions and nuances of English writing.