Normally, effective communication should be two-way (there should be a message sent, and then feedback). Words should not be mixed, and if communication is face-to-face, eye contact should be used often. If you are the listener, be sure to acknowledge his words by occasionally uttering "Mm-hmm", "yes", and other similar phrases. For different purposes, different modes of communication should be used. Memorandums are often written down on a piece of paper and stuck to a wall. E-mails are used to communicate with a person at long range, sometimes without a reply.