Many of the firms listed in this year's ENR Top 400 Contractors list are using cutting-edge Lean construction principles to manage their projects. Helping pioneer Boldt’s proprietary Integrated Lean Project Delivery® (ILPD) method, our chief operating officer Dave Kievet knows first-hand how Lean construction lends itself to collaboration throughout the entire project. See how we ranked in the Top 400 List and hear from Dave in ENR's cover story.