At a lively science and education fair in Okayama, Japan, a group of high school students discovered that a LEGO® helicopter can reveal the hidden mathematics of global commerce. In a five-minute manufacturing challenge, participants sorted parts, assembled components, managed inventory, inspected finished products, and competed to produce as many complete helicopters as possible. The exercise, developed by students and faculty members at Okayama University of Science (OUS), transformed supply chain management from an abstract business topic into a fast-moving experiment in coordination, efficiency, quality control, and waste reduction.
The workshop took place on August 6 at the Okayama SDGs Fair 2026 in Okayama City. It was based on the “LEGO® Supply Chain Simulation,” a teaching activity made available by the Fisher College of Business at The Ohio State University and adapted by students in the OUS Faculty of Management. Although the materials were simple—piles of LEGO bricks, assembly stations, score sheets, and a clock—the system reproduced many of the pressures faced by real manufacturers. Participants had to balance production speed against product quality, respond to changing demand, communicate across operational stages, and avoid accumulating parts that could not be used before the round ended.
Each team operated as a miniature production network. One participant searched through a large pile of bricks to find the required components, while three others assembled separate sections of the helicopter: the body, rotor, and skids. A fifth participant performed the final assembly, bringing the components together into a completed product, and another acted as an inspector. This division of labor represented a simplified version of the specialized functions found in industrial supply chains, where procurement, component manufacturing, final production, logistics, and quality assurance must work together without losing information as products move from one stage to the next.
The scoring system introduced a technical problem familiar to manufacturers around the world: output alone is not enough to measure performance. Every completed helicopter earned 200 points, but teams lost 10 points for each unused part left at the end of a round. The penalty represented the financial and operational cost of excess inventory. Unused stock occupies space, ties up capital, can become obsolete, and may conceal problems elsewhere in the production system. At the same time, producing too quickly without adequate inspection could create defective products. The teams therefore had to optimize several variables simultaneously: throughput, inventory levels, synchronization, and quality.
The first five-minute round exposed how easily a production system can become inefficient when its participants lack shared information. Both teams finished with large amounts of unused inventory, reducing their scores. Some helicopters that appeared complete were rejected during inspection because they contained defects, demonstrating how errors introduced early in a process can travel downstream and become costly at the final stage. The experience offered a compact illustration of process variation: even when workers are moving quickly, inconsistent assembly methods or incomplete communication can reduce the number of acceptable products that reach the customer.
The simulation changed significantly in the second round, when teams were permitted to order the parts they needed instead of relying entirely on the initial pile. This new rule introduced the logic of a demand-driven production system. Rather than pushing materials forward in anticipation of possible use, participants could signal their requirements and request components according to the needs of the assembly process. Their performance improved dramatically. By the third round, team members were not only assembling their own components but also watching the progress of final assembly and adjusting their actions accordingly. One team completed the round with no remaining inventory, a result that reflected tighter coordination between supply and demand. Team A ultimately scored 800 points, while Team B reached 1,120.
The exercise demonstrated why information flow is as important as the physical movement of goods. In a conventional factory, delays or inaccuracies in communication can produce a “bullwhip effect,” in which small changes in customer demand create increasingly large fluctuations in orders placed with suppliers. Excess stock may then appear in one part of the network while another area experiences shortages. The LEGO simulation compressed this complex phenomenon into minutes. Participants could immediately see the consequences of over-ordering, slow handoffs, poor synchronization, and inadequate quality checks. Because the results were visible and measurable, the students did not simply hear about supply chain theory; they generated evidence of it through their own decisions.
Between rounds, six OUS students who had previously studied the simulation in class explained the management principles behind the game. Among the facilitators were fourth-year Faculty of Management students Takuya Matsumoto and Mio Murota. They introduced participants to concepts associated with Toyota’s Lean production philosophy, including Kanban, Kaizen, and the elimination of the seven types of waste. Kanban is commonly understood as a signaling method that helps regulate production by authorizing the movement or replenishment of materials when they are needed. In the workshop, the ability to request parts provided a simple demonstration of this pull-based approach, in contrast to producing or collecting materials in advance without reliable information about actual demand.
Kaizen, meaning continuous improvement, became visible as participants modified their behavior from one round to the next. They began to communicate more frequently, divide responsibilities more clearly, and monitor bottlenecks instead of focusing only on their individual tasks. The seven forms of waste addressed in Lean thinking include overproduction, waiting, unnecessary transport, overprocessing, excess inventory, unnecessary motion, and defects. Nearly all appeared during the simulation. Teams waited when components were unavailable, moved inefficiently when parts were poorly organized, accumulated inventory when demand was unclear, and lost points when defective helicopters reached inspection. The game showed that Lean production is not simply about working faster; it is about designing a system in which useful work proceeds smoothly while avoidable effort is removed.
For the high school participants, the competition turned an unfamiliar business discipline into an experience that was both social and intensely practical. As the rounds progressed, the atmosphere grew more energetic, with teams working faster and communicating more often. One student said the workshop was enjoyable and had encouraged a deeper interest in studying supply chains. Professor Makoto Uchida, who supervised the event, said the participants’ enthusiasm demonstrated the value of hands-on business education. He also emphasized that concepts developed and refined through globally recognized production systems can become easier to understand when people experience them directly. For the OUS students, the event provided a second layer of learning: they had to translate complex theories into clear explanations and guide participants through the consequences of their decisions. By the end of the workshop, a pile of plastic bricks had become a working model of a global economic system—and a vivid demonstration of how small changes in information, timing, and coordination can transform performance.
Subject of Research: Experiential education in supply chain management, Lean production, inventory control, manufacturing coordination, and quality assurance.
Article Title: LEGO® Supply Chain Simulation Turns a Five-Minute Helicopter Challenge Into a Lesson in Lean Manufacturing
Web References: https://mediasvc.eurekalert.org/Api/v1/Multimedia/9095dcdc-09d4-4c23-b7bc-e02b0bd7c0a8/Rendition/low-res/Content/Public
References: Fisher College of Business at The Ohio State University, LEGO® Supply Chain Simulation; Toyota Lean production concepts, including Kanban, Kaizen, and the seven types of waste.
Image Credits: Okayama University of Science
Keywords: supply chain management, LEGO simulation, Lean manufacturing, Kanban, Kaizen, inventory management, logistics, manufacturing education, experiential learning, quality control, Okayama University of Science, STEM education
