With assertion of collusive behavior in public construction projects, this report looks at the best practices meant to detect and to deter collusion in procurement. Based on regulatory frameworks, an overview of actual processes in public procurement and of construction industry regulation is explored. The economic analysis of tender as a bidding process, and of a cartel's internal logic, helps understand the impact of collusive behavior in public procurement. Also, drawing on best practices, this report suggests the means to detect and to deter collusion with improvements to the Québec's public procurement framework.