- Know what is meant by lean controls, and why the subject can be confusing.
- Understand the application of lean.
- Know the five core principals of lean.
Lean control, or simply lean, has become an immensely popular business control and improvement methodology in recent years. Lean control is a highly refined example of nonfinancial controls in action. Lean is a system of nonfinancial controls used to improve product and service quality and decrease waste. Research suggests that up to 70% of manufacturing firms are using some form of lean in their business operations (What They Think, 2008). Lean was initially focused on improving manufacturing operations but is now used to improve product development, order processing, and a variety of other nonmanufacturing processes (sometimes called “lean in the office”).
What Is Meant by Lean Control?
Lean’s popularity has both resulted from, and been driven by, an explosion in the volume of lean-related educational resources. Amazon offers almost 1,800 books and other materials about lean, and Yahoo! hosts over 90 online discussion groups relating to lean. Colleges and universities, industry trade associations, and private consulting firms routinely offer courses, seminars, and conferences to explain what lean is and how to use it.
Lean control is a number of things. According to James Womack, “it is a process for measuring and reducing inventory and streamlining production. It is a means for changing the way a company measures plant performance. It is a knowledge-based system. It takes years of hard work, preparation and support from upper management. Lean is so named because it purports to use much less of certain resources (space, inventory, workers, etc.) than is used by normal mass-production systems to produce comparable output.” The term came into widespread use with the 1990 publication of the book The Machine That Changed the World, by James P. Womack, Daniel T. Jones, and Daniel Roos (Womack, et. al., 1990).
This abundance of education resources on the topic of lean is actually a mixed blessing for managers who are just now becoming interested in lean. On the one hand, today’s managers don’t have to search far to find lean materials or programs. But the wealth of lean resources can also be a source of confusion for two main reasons. First, there is no universal definition of lean and little agreement about what the truly core principles of lean are. For instance, quality programs such as Six-Sigma, or even lean Six Sigma, are other titles competing for the “lean” intellectual space. Therefore, lean experts often approach the subject from differing perspectives and describe lean in different ways. To make matters worse, lean is a topic that produces a significant amount of zealotry. So, many experts strongly argue that their particular “brand” of lean is the one right way to implement and use lean. In these circumstances, it’s no wonder that managers become confused about where and how to begin.
Lean will always be associated with Toyota Motor Corporation because most lean tools and techniques were developed by Toyota in Japan beginning in the 1950s. After World War II, Toyota’s leaders were determined to make the company a full-range car and truck manufacturing enterprise, but they faced several serious challenges. The Japanese motor vehicle market was small and yet demanded a fairly wide range of vehicle types. This meant that Toyota needed to find a way to earn a profit while manufacturing a variety of vehicles in low volumes. In addition, capital was extremely scarce, which made it impossible for Toyota to make large purchases of the latest production equipment. To succeed, or even survive, Toyota needed a way to build vehicles that would require fewer resources. To achieve this goal, Toyota’s leaders, principally Eiji Toyoda and Taiichi Ohno, began to create and implement the production techniques and tools that came to be known as lean (Toyota, 2009).
To gain the most benefits from lean, managers must be able to determine what specific lean tools and techniques will be effective in their particular business. And to make that determination, they must clearly understand what lean is designed to accomplish (its primary objectives) and what core principles lean is based on. With this understanding, managers can decide which lean tools will work well in their business, which lean tools will need to be modified or adapted to work well, and which tools are simply not appropriate.
What, then, are the major objectives and core principles of lean? Despite the arguments and debates that often surround attempts to define and describe lean, it is clear that the ultimate objective of lean is the avoidance of muda, or wasteful activity, in all business operations. As shown in the following figure, muda comprises seven deadly wastes. In the lean world, waste means any activity or condition that consumes resources but creates no value for customers. Therefore, waste includes the production of defective products that must be remade or fixed, the production of more products than the market will buy, excessive work-in-process inventories, overprocessing (processing steps that aren’t really needed or that add no value), unnecessary movement of people or products, and unnecessary waiting by employees.
Elimination of Waste Is the Soul of Lean
Muda is a Japanese term for activity that is wasteful and doesn’t add value. It is also a key concept in lean control. Waste reduction is an effective way to increase profitability. Here are the seven deadly wastes, along with their definitions:
- Defects prevent the customer from accepting the product produced. The effort to create these defects is wasted. New waste management processes must be added in an effort to reclaim some value for the otherwise scrap product.
- Overproduction is the production or acquisition of items before they are actually required. It is the most dangerous waste of the company because it hides the production problems. Overproduction must be stored, managed, and protected.
- Transportation is a cost with no added value. In addition, each time a product is moved it stands the risk of being damaged, lost, and delayed. Transportation does not transform the product in any way that the consumer is willing to pay for.
- Waiting refers to both the time spent by the workers waiting for resources to arrive, the queue for their products to empty as well as the capital sunk in goods and services that are not yet delivered to the customer. It is often the case that there are processes to manage this waiting.
- Inventory in the form of raw materials, work-in-progress, or finished goods represents a capital outlay that has not yet produced an income either by the producer or for the consumer. Any of these three items not being actively processed to add value is waste.
- Motion refers to the actions performed by the producer, worker, or equipment. Motion has significance to damage, wear, and safety. It also includes the fixed assets and expenses incurred in the production process.
- Overprocessing is defined as using a more expensive or otherwise valuable resource than is needed for the task or adding features that are designed for but unneeded by the customer. There is a particular problem with this item regarding people. People may need to perform tasks that they are overqualified for to maintain their competency. This training cost can be used to offset the waste associated with overprocessing.
The Five Core Principles of Lean
Lean methodologies are lean because they enable a business to do more with less. A lean organization uses less human effort, less equipment, less facilities space, less time, and less capital—while always coming closer to meeting customers’ exact needs. Therefore, lean is not just another cost-cutting program of the kind we often see in business organizations. Lean is much more about the conservation of valuable resources than it is about cost cutting.
In their best-selling book, Lean Thinking, James Womack and Daniel Jones identified five core principles of lean (Womack & Jones, 2003). Let’s examine them one by one.
Define Value from the Customer’s Perspective
The first core principle in the Womack/Jones lean framework is that value must be defined and specified from the customer’s perspective. While this seems simple enough, it requires much more than high-sounding, generic statements. To be meaningful, value must be defined in terms of specific products. This means that managers must understand how each specific product meets the needs of specific customers at a specific price and at a specific time.
Describe the Value Stream for Each Product or Service
The second core principle of lean is to describe the value stream for each product or service (or, in some cases, for groups or families of similar products). The value stream is the set of activities that the business is performing to bring a finished product to a customer. It includes both direct manufacturing activities and indirect activities such as order processing, purchasing, and materials management. Developing a detailed description or map of each value stream usually reveals huge amounts of waste. It enables managers to identify which value stream activities add value to the product, which activities add no value but cannot be immediately eliminated for various reasons, and which activities create no value and can be immediately eliminated (or at least reduced substantially).
Create Flow in Each Value Stream
The third essential principle of lean is embodied in the word flow. When a value stream has been completely described as unnecessary, non-value-adding activities have been eliminated, the basic idea of flow is to arrange the remaining activities sequentially, so that products will move smoothly and continuously from one activity to the next. However, flow means more than ease of movement. Flow is the lean principle that directly challenges the traditional “batch-and-queue” model of manufacturing, where people and equipment are organized and located by function, and products (and component parts) are manufactured in large batches. Lean organizations strive to improve flow by reducing the size of production batches, and in the process, they increase flexibility and lower costs.
Produce at the Pace (Pull) of Actual Customer Demand
Producing at the pace or pull of actual customer demand is the fourth key principle of lean. One of the greatest benefits of moving from traditional batch-and-queue manufacturing to continuous flow production is that lead times fall dramatically. Reduced lead times and increased flexibility mean that lean organizations can respond to actual customer demand rather than attempt to predict in advance what that level of demand will be. This allows lean organizations to substantially lower both finished goods and work-in-process inventories.
Strive to Continuously Improve All Business Operations
The fifth core principle of lean is continuous improvement, expressed in Japanese by the word kaizen. Companies that implement lean adopt the mind-set that it is always possible to improve any business activity, and they regularly conduct kaizen events throughout their organizations to improve specific processes or operations. Today, Toyota is recognized as one of the most “lean” business enterprises in the world. Even more daunting, and humbling, is the fact that Toyota is still striving to improve.
Lean control, or simply lean, is the system of nonfinancial controls used to improve product and service quality and decrease waste. While popularized through the dramatic successes of Toyota in auto manufacturing, lean processes are used to improve quality and decrease waste in most service and manufacturing industries around the world. In this section, you saw examples of the seven deadly wastes (muda) and the five core principles of lean which culminate in continuous improvement, or kaizen.
- What is lean control?
- What types of industries might find lean controls valuable?
- What does muda mean and what are some examples of it?
- What are the five lean principles?
- Pick a company you are familiar with—what would it need to do differently to comply with the five lean principles?
Toyota, retrieved January 30, 2009, from http://www.toyota.co.jp/en/history/index.html.
What They Think, PrintPlanet launches lean manufacturing forum. (2008, August 11). Retrieved January 30, 2009, from http://members.whattheythink.com/home/wttnews080811.cfm.
Womack, J. P., Jones, D. T., & Roos, D. (1990). The machine that changed the world. New York: Rawson Associates, 1990.
Womack, J. P., & Jones, D. T. (2003). Lean thinking. New York: Simon & Schuster.