Estimates suggest that 75% of the world population speaks more than one language. This means that more than half of the population is bilingual. Language is an everyday notion and activity in the life of human beings, one of the main tools in socialization. This book deals with the framework of first language acquisition (Chomsky, Skinner, Krashen, Piaget) and bilingualism. Different theories are presented concerning children learning to speak and in two case studies the topics are discussed from the point of view of two bilingual families. Individual differences and social contexts make...