The new psychiatric bible, DSM 5, which is the world's most widely used psychiatric reference book, has been released in draft form. Already, more than 11,000 people have signed a petition calling for it to be rewritten and re-thought. Some claim the new edition broadens the range of behaviours considered indicative of mental illnesses to a point where normal quirks of personality will lead to erroneous diagnoses.

David Kupfer who chairs the DSM 5 committee for the American Psychiatric Association, which put the book together, and Peter Kinderman, professor and honorary Consultant Clinical Psychologist with Mersey Care NHS Trust, debate the pros and cons of the book.

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