Where border between an invention and deception? In what the reason of a children's lie is? Perhaps that the child wants to seem better, than is. Or he is pushed on it by fear. Or perhaps your child just imitates adults.
The child of 4-5 years comes from kindergarten home and tells a tall tale that for lunch they were fed only with candies. It is very serious and takes offense if you do not trust it. He is sure that he tells the truth. It is not deception, but imagination which the kid takes for reality. And it is kind of frequent it told unlikely stories, adults distinguish the truth from an invention at once. Also you should not abuse the little visionary, suddenly the great storyteller will grow up from him. In school days the lie at children accepts completely different quality. At this age do not confuse an invention and reality any more. Deceive in order that to achieve something. The sly fellow understands that his offense will be surely followed by punishment and tries to deceive, with the purpose to secure himself: "I did not break a window", "I do not know who made it". Or still it is worse than that, tries to shift the blame on another: "The book was torn by Petya". What will be with Petya and why that has to be responsible for others offense, does not concern the liar. The child communicates with other children much and deceives to raise the social status. He thinks out and gives for reality that as it seems to it, will ennoble it over others: "Will buy me the new bicycle soon", "At me the computer is better, than at you", "My dad the richest". Children deceive to shirk undesirable work: "I should do homework - I will not go to buy some bread", "I cannot go to school – the head hurts me". Of course, deception will reveal sooner or later. And here parents should show as much as possible step. Do not abuse the child for lies, try to find out very carefully why he went for deception. Explain why he is wrong. Also think whether not too severely you punish the child why he is afraid of you? Having reached teenage age, children begin to lie also to avoid guardianship of parents. Excessive control, violation of borders of personal space force the teenager to resort to deception. It is very dangerous. The child can get involved in a bad story, begin to do drugs, to commit a crime. Parents have to understand that the child grew up and needs to some extent freedoms. It will help to keep trust between you and the child, he will not begin you to lie, and you will be able to control a situation. And the main thing that should be remembered: the child copies behavior of parents. If in your family kind trusting relationship, the child lies only "for the good". For example, will never tell that it does not like a gift, and will smile and will thank.