62. It is essential that good records are maintained of Changes made in a Project with Major Changes formally documented by Deed. This is necessary for a number of reasons, including the need for an audit trail, the need to provide evidence if any disputes arise concerning the Change later, to re-set the "baseline" to be used in any future benchmarking/market testing exercises or VfM reviews and to avoid paying twice for items, such as lifecycle costs. Recorded information can also be used to identify trends in behaviours, which may in turn allow better practice to be developed. Our survey of acquisition team members showed that not all teams within the MOD maintained this discipline.