Communicative Competence

is the knowledge of the language code, its grammar and vocabulary and also of the conventions of its written representation (script and orthography).

is the knowledge of sociocultural rules of use, i.e. knowing how to use and respond to language appropriately. The appropriateness depends on the setting of the communication, the topic, and the relationships among the people communicating.

is the knowledge of how to produce and comprehend oral or written texts in the modes of speaking/writing and listening/reading respectively. It's knowing how to combine language structures into a cohesive and coherent oral written text of different types.

is the ability to recognize and repair communication breakdowns before, during, or after they occur. For instance, the speaker may now know a certain word, thus will plan to either paraphrase, or ask what the words is in the target language.

phonology, phonetics, script and orthography, morphology, syntax, semantics

Its appropriateness depends on the setting of the communication, topic, and relationships among the people communicating. Being appropriate also depends on knowing what the taboos of the other culture are, what politeness indices are used in each case, what the politically correct term would be for something, how a specific attitude (authority, friendliness, courtesy, irony, etc.) is expressed.

It is knowing how to combine language structures into a cohesive and coherent oral written text of different types. (speeches, poetry, email messages, newspaper articles, etc.)

The speaker must know how to keep the communication channel for open, The speaker must know how to restore communication, It may be request for repetition, clarification, slower speech, or the usage of gestures, taking turn in conversation, etc.