Muda refers to any activity that does not add value, according to Toyota production system founder Taichi Ohno. He identified seven common forms of muda, or waste: overproduction, waiting time, transportation, processing defects, unnecessary inventory, unnecessary motion, and overprocessing. Reducing or eliminating these wastes improves productivity and efficiency. Strategies to address each type of waste include improving production planning, minimizing movement of materials, reducing defects, and optimizing processes. Muda can occur throughout manufacturing and office operations, so eliminating it requires analyzing processes across the entire organization.