Merriam-Webster defines communication as a process by which information is exchanged between individuals through a common system of symbols, signs, or behavior.
Communication is simply the act of transferring information from one to another.
Although these are simple definitions, when we think about how we may communicate the subject becomes a lot more complex. There are various categories of communication and more than one may occur at any time.
The teachers and therapists are required to open themselves to receive the communication coming from the children. This is accomplished through doing focused inner work such as meditation and to fine tune their own listening skills even among themselves.