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A leaflet which is part of the series of guidance notes from the ICE Legal Affairs Panel written to clarify contentious issues affecting the civil engineer. The information combines points of law with principles derived from the ICE's Rules of Professional Conduct. Collateral warranties refer to documents given or intended to be given by engineers, or others, for the purpose of creating legal relationships which would not otherwise exist. This booklet explains the different types of warranties, considerations as to their preparation and use, what they cover and specific examples.