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Problems with the current methods of attaching child restraints to the vehicle structure have led to the development of new attachment systems. These proposals have been coordinated by the International Standards Organisation (ISO) with the intention of generating an international standard system for the attachment of child restraints - ISOFIX. These proposals attempt to balance the requirements for good dynamic performance in impacts with the requirements for ease of use, low misuse and the cost and complexity of the child restraint and of incorporating the system into the vehicle design. This research programme was designed to compare the dynamic performance of a range of systems and how they would be used by parents. Prototype child restraints designed to four different schemes being proposed for ISOFIX were produced based on a single design of child seat shell. These were subject to frontal, side and rear impacts.