This article deals with human development as a biosociopsychological phenomena with an emphasis on the theoretical outlooks of outstanding phenomenologists such as Freud, Erikson and Piagent. First, life cycles, and then the interaction of human sensory systems with the external stimuli, and the information processing system involved are discussed, with a special emphasis on the relation between speech and information processing. Speech as a medium for acquistion of information differentiates higher levels of biological organisms from the lower ones, makes possible the cognitive exchanges between human beings and creats new structural relations.