Workers in this unit group perform technical tasks, normally under the direction and supervision of civil engineers, building architects or surveyors, contributory to planning and execution of building and civil engineering projects, including new construction, repair and maintenance. Their functions include: estimating quantities and costs of building materials and labour required for execution of construction projects and preparing bills of quantities; performing technical tasks contributory to execution of surveys and preparation of survey reports; representing building architects on construction sites to ensure compliance with design specifications and maintenance of desired standards of materials and workmanship; applying knowledge of building and civil engineering theory and practices to recognise and solve problems arising in the course of their work. Civil engineering draughtsman is classified in 0-31.40 and Architectural draughtsman in 0-31.50.