39. This assessment revisits the quantitative assumptions made at Stage 1. The project team should update the spreadsheet in light of the project's specific characteristics and on the basis of past experience. However, an input should only be changed where there is justifiably better information, e.g. capital expenditure. Teams should not alter the figures estimated; especially for risk factors such as Optimism Bias, without substantial evidence supporting the change. Further guidance and help on the Stage 2 Quantitative Assessment will be provided by DASA-DESA and MOD PFU.