“…In this group, the most commonly mentioned risk caused by information asymmetry in construction research is incomplete or flexible contracts. The risk refers to loosely defined rights and obligations of the principal and the agent, as well as the rewards and punishments for the agent [29,32,34,55,71,74,77,78,87,97,98,102,107]. If all the risk is assumed by the principal, the agent will not pay attention to their behavior and mistakes in the project because they feel "safe".…”