The Last Planner System (LPS) is a Lean system for planning and managing work in construction projects. It aims to deliver value to the client without waste by ensuring smooth workflow and coordination among specialists. The system focuses on creating a coherent set of commitments that connect the work of specialists to the project's promises to the client. This is achieved through five recurring conversations: pull-planning for production system design, make-ready planning, weekly work planning, daily commitment management, and learning from performance. The LPS is designed to bring stability to projects by focusing on workflow and reducing variation in the hand-off of work between specialists. It is used not only in construction but also in design, where it helps manage commitments among specialists. The LPS is trademarked by the Lean Construction Institute (LCI) to ensure proper use and meaning of the term. LCI encourages the use of the LPS but requires the trademark to be included in any document. The LPS is part of a broader set of Lean construction practices and is often used in conjunction with other methods such as integrated project delivery. It has been applied in various case studies, including the Jackson Federal Building, the EM Dirkson Courthouse, and the Parkland Hospital. The system emphasizes continuous improvement, accountability, and the elimination of waste through coordinated planning and execution. The LPS is a key tool in Lean construction for improving efficiency, safety, and productivity in construction projects.The Last Planner System (LPS) is a Lean system for planning and managing work in construction projects. It aims to deliver value to the client without waste by ensuring smooth workflow and coordination among specialists. The system focuses on creating a coherent set of commitments that connect the work of specialists to the project's promises to the client. This is achieved through five recurring conversations: pull-planning for production system design, make-ready planning, weekly work planning, daily commitment management, and learning from performance. The LPS is designed to bring stability to projects by focusing on workflow and reducing variation in the hand-off of work between specialists. It is used not only in construction but also in design, where it helps manage commitments among specialists. The LPS is trademarked by the Lean Construction Institute (LCI) to ensure proper use and meaning of the term. LCI encourages the use of the LPS but requires the trademark to be included in any document. The LPS is part of a broader set of Lean construction practices and is often used in conjunction with other methods such as integrated project delivery. It has been applied in various case studies, including the Jackson Federal Building, the EM Dirkson Courthouse, and the Parkland Hospital. The system emphasizes continuous improvement, accountability, and the elimination of waste through coordinated planning and execution. The LPS is a key tool in Lean construction for improving efficiency, safety, and productivity in construction projects.