What are the main duties of contractors under the CDM Regulations?

Contractors must co-operate with each other and with the principal contractor to co-ordinate their work activities. (This applies to adjoining sites as well as the project they are directly involved in.) Contractors should be competent for the work they are doing; plan, manage and monitor their own work to ensure health and safety; and provide suitable information and training for their workers to ensure their health and safety.