Along this paper we explore the diverse ways to analyse the relation between actors. Our paper shows that the difference of perception from the different actors is rarely studied. We choose the FAcT Mirror® method which allows us to study the difference of perception of actors toward each other in a given situation, here in the construction industry. We use this method to structure a survey about the Fears, the Attractiveness, and the Temptation of treason actors can have in their relation. We decided to do a step aside the method to explore the gap between actors' perception about the other actor's feeling. The added value of our paper is that our results allow us to have a better understanding of the relation between Owners and Contractors on a construction project. The gap of notation of items is a concern, the two hypothesis we formulate, the contractor has a better knowledge of Owners and Contractor may be reluctant to evaluate honestly his temptation, need to be deepened. We make the supposition that there are complementary, this is an assumption we need to verify. Also, to understand the roots of these differences of perception should allow us to find link with production and project control processes involved. We also want to confirm the findings concerning actors' behaviour toward law, it would be particularly useful to understand this aspect of actor's behaviour and to see if we can reach the same results in a country with a different level of maturity of their legal system. The next steps will be to enlarge these studies to other construction project's context and to compare to findings in literature.