FLEXIBILITY IN DESIGN - Title Page - MIT

de Neufville + Scholtes D R A F T September 30, 2009Percentage of Projects30%25%20%15%10%5%0%28.3%21.2%13.6%12.0%6.6%4.4% 3.9%2.2% 3.3% 1.2%1.1% 1.1% 1.1%-70% -50% -30% -10% 10% 30% 50% 70% 90% 110% 130% 150% 170%Inaccuracy for Road ProjectsFigure 2.2: Discrepancies between the forecast and actual costs of road projects, adaptedfrom Flyvbjerg et al (2005). Need to specify units – cost or demand…redo 2.2 and 2.3 to besimilar.302520Frequency151050-90 -70 -50 -30 -10 10 30 50 70 90 110 130 150Inaccuracy of Traffic Forecasts for Rail (%)Figure 2.3: Discrepancies between the forecast and actual costs of rail projects, adaptedfrom Flyvbjerg et al (2005).Part 1: Chapters 1 to 3 Page 41 of 69