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The CJ40 League records the competitive positions of the industry's leading players. Tables are based on a monthly analysis of the UK's major building and civil engineering contracts secured in competition or by negotiation.

Only contracts over œ500,000 are included and care is taken to exclude speculative housebuilding and property development which generate workload not won in competition.

Management contracts are included but, when packages are sublet by the client as in construction management, only management fees are included.

Subcontracts for M&E services and minor internal finishing are not included; subcontracts for work forming the shell of a building or foundations are included.

Data provided by contractors is verifiable and based on identifiable contracts. There is no distortion due to time overlaps. Published tables are corrected retrospectively without notice when any figures are obtained too late for publication. Revised data is then used in subsequent quarterly and annual tables.

Neither the publishers of CJ nor the compilers of the data can be held responsible for readers' interpretations nor for any reliance they place on the data.

Specific details about many individual contracts, upon which CJ40 League tables are based, are commercially confidential and cannot be disclosed.

Requests for additional information, commentary, explanations about the tables or longer term trends should be sent in writing to: CJ40 Editor, Contract Journal, Quadrant House, Sutton, Surrey SM2 5AS (or fax 0181 307 7696).