As there are probably a thousand ways to say the same thing, and just as many to "hear" what someone else is telling us, it is clear that the simplest everyday process of "saying something to someone" is not that simple.
Because the entirety of our verbal and non-verbal communication is essentially the only medium to convey - and therefore share - our ideas, expectations, and feelings, it is more than important that the clearer and more mutual our communication codes are, the more effective our interpersonal communication becomes. Alan Garner's book The Art of Communication, written by an expert in the art of understanding and addressing communication problems, and by someone who has taught this art countless times over the years, is the distillation of the author's vast experience.