Taiichi Ohno introduced the Toyota Production System (TPS) which focused on eliminating waste to reduce costs. TPS has two parts: technical aspects like Just-In-Time (JIT) production and human/people aspects. JIT production is based on only producing what is needed, when it is needed, in the needed quantity based on customer demand pulling parts through the process rather than a push system. This pull system is facilitated through Kanban cards that visually signal production needs and parts delivery. Ohno identified seven types of waste that TPS aims to eliminate through continuous improvement approaches like Kaizen.