Question: what are the most important characteristics of communication tools choose four?
Answer: Completeness. Effective communications are complete, i.e. the receiver gets all the information he needs to process the message and take action. ... 
Conciseness. Conciseness is about keeping your message to a point. ... 
Consideration. ... 
Concreteness. ... 
Courtesy. ... 
Clearness. ... 
Correctness.