The factors

1.      Complex contractual structure

2.      Complex contractual documentation

3.      Numerous measurable activities

4.      Diversity of skills

5.      Number of project phases

6.      Cost of large projects

7.      Uniqueness of projects

8.      Complexity of projects

9.      Location of projects

10.  Ability to conceal corruption

a)      Concealed work

b)      Concealed ownership structures

c)      Untraceable payment methods

d)      False documentation

e)      Intermediaries

11.  Lack of transparency

12.  Acceptance of status quo

13.  Incorrect perception that no victim

14.  Insufficient reporting of corruption

15.  Insufficient prosecution of corruption

16.  Insufficient anti-corruption controls