In foreign language classes, writing, listening and speaking are widely regarded as a practice that follows specific rules. Because the learner should understand the language in the verbal form, and begin the writing process after he / she has the ability to understand and use it. Writing skills are more difficult and relatively longer than other language skills.
Penny Ur. A course in language teaching Practise and theory, 2008
Jeremy Harmer. How to Teach English 2nd Edition, 2010
fluentlanguage.co.uk/blog/techniques-speaking-writing-foreign-language, 2011