Lean learning labs┬áTurner Construction has embarked on a company-wide effort to use the principles of lean to improve its project delivery. Keith Regan learns how projects across the country have become learning laboratories and how subcontractors and project owners are all embracing the new approaches. Turner Construction is one of the largest building companies in the United States, completing $10.7 billion worth of diverse contracting work in 2008. ItÔÇÖs also one of the oldest, with more than a century of experience since its founding in 1902.