1. Introduction. 2. Diagrams. 3. Example bill of quantities pages. Class A: General items (including methods-related charges). Class B: Site investigation. Class C: Geotechnical and other specialist processes. Class D: Demolition and site clearances. Class E: Earthworks. Class F: In-situ concrete. Class G: Concrete ancillaries. Class H: Precast concrete. Class I: Pipework- pipes. Class J: Pipework- Fittings and valves. Class K: Pipework- manholes and pipework ancillaries. Class L: Pipework- supports and protection, ancillaries to laying and excavation. Class M: Structural metalwork. Class N: Miscellaneous metalwork. Class O: Timber. Class P: Piles. Class Q: piling ancillaries. Class R: Roads and paving. Class S: Rail track. Class T: Tunnels. Class U: Brickwork, blockwork and masonry. Class V: Painting. Class W: Waterproofing. Class X: Miscellaneous work.