Many teachers use predominantly the spoken family. Many use predominantly the spoken and written families. This text lists and examines the use of each language family, the languages in the group, the interrelations between them and suggestions for maximal language use. If you read the above paragraph, the message was not communicated or received in the same way as if you were the one listening to the paragraph being read. Listening is different from reading.
Verbal communication is different from written communication.
If you look at the figure on the left, above, the message is very different than if you look at the figure in the middle, above. Each has exactly the same words. In each the words are in the same order from top to bottom. We recognize conventions in pictorial presentation. The words in the middle picture are ordered and the words in the left appear to float or assume nebulous positions.