Communication - This skill  is the most important  psychological need. It can be done with eyes, gestures, voice or even computers. Communication requires concentration, whatever the method necessitates the ability to receive information, interpret, and respond. 

Feeding - The oral-motor precursor to speech. Involves ability to chew, swallow and drink safely, without coughing, choking or fatigue. Requires coordination between breathing patterns and movements of the mouth and tongue..

Speech - A method of communication using the voice. Involves the ability to sustain a long, effortless exhalation as the words are spoken. Requires the fine muscles of the face , tongue, and jaw to move with absolute control. Should be easily understood by all.