Lean construction aims to reduce waste and improve productivity in the construction industry. It targets seven types of waste including defects, overproduction, and unnecessary transportation. Lean construction attacks waste through three angles: project delivery, organization, and integrated project delivery. Some benefits of lean construction include reduced costs, improved schedule reliability, and increased productivity and profits. However, there are also some drawbacks such as getting all employees onboard with changes, the time needed for training, and the risk of breakdowns in the new systems. Lean construction emphasizes eliminating waste to deliver more value to customers.