Quantity surveyors provide cost management services throughout construction projects. They estimate costs, prepare bills of quantities, and advise clients on procurement and contractual methods. The Quantity Surveyor Certified Board regulates the profession and consists of a president, registrar, secretary, and 16 members appointed by the Ministry of Works. Quantity surveyors' responsibilities include cost planning, estimating, tendering, contract administration, and resolving payment disputes. They monitor costs at different construction stages and certify payments.