2.8 Ambiguities in the contract made disagreements on scope inevitable. On the stations programme, there was no clear definition of a 'Modernisation', 'Refurbishment' or 'Enhanced Refurbishment'. The specification for modernisation work, for instance, was only 600 words long and left considerable room for interpretation, leading to frequent, time consuming disagreements between Metronet and London Underground. Metronet and London Underground's different interpretations of London Underground standards also led to a number of disputes. The enhanced refurbishment of Stockwell Station by Tube Lines illustrates the type of issues that arose (Appendix 5).
2.9 London Underground did take steps to address these problems, working with Metronet and Tube Lines to agree guidance in 2004 on assurance processes for agreeing scope and completing stations. Metronet failed to take steps to implement these agreed processes.