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The CITB Temporary Works Supervisor course, often shortened to TWS, is a 1-day course for people who supervise temporary works on a construction site. It is part of the CITB Site Safety Plus scheme and, like the coordinator course, is built around BS 5975, the British Standard code of practice for temporary works.
Temporary works are the parts of a project that support the permanent works while they are built, such as excavation support, formwork, falsework and propping. The Temporary Works Supervisor oversees specific temporary works on the ground, making sure the agreed procedures are followed and risks are controlled during day-to-day operations. The role supports the Temporary Works Coordinator, who holds overall responsibility for the process. A supervisor is usually appointed on larger sites, or where the coordinator is managing several sites at once.
This is not a general awareness course; its focus is the role and responsibilities of the supervisor under BS 5975. Anyone taking overall responsibility for temporary works should take the 2-day Temporary Works Coordinator course instead.
The certificate is valid for 5 years. To stay certified, supervisors retake the course before the certificate expires.