It is commonly believed that any bilingual person can translate. However most fail at written translations. This is because such informal translation is oral, not written. For an informal translator, any translation which communicates the main idea of the message suffices. But in a professional translation, the original document must be understood thoroughly and accurately. There are professional standards which a translator needs to follow. And while bilingual interference may not be as important in an informal translation, it is a serious problem in professional translation. Later I’ll continue on the subject by talking about the importance of Consistency.