[img]/images/graemlins/wink.gif[/img] [img]/images/graemlins/wink.gif[/img] Perhaps you should read the material under this link. It will help you forumate better questions in order to avoid posts such as this, where several people responded to your original background-lacking question, and - then you changed the question.
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what is the main characteristic of a Defect?
eg: brain is the main characteristic of a human body)
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Please be more specific.. question is not clear to me...
how can brain be main characteristic of humna body?
what does charateristic mean first of all to you testboy1???