Lean manufacturing – definition, principles, and tools
The lean manufacturing system involves managing production processes with a focus on eliminating waste and continuously improving the organization. Factories operate under intense pressure – they must optimize production processes, shorten lead times, and reduce costs while maintaining high product quality. Lean manufacturing methods help companies increase process efficiency and build a flexible production environment. Below, we have prepared a comprehensive guide in which we discuss the definition, principles, and main tools of lean manufacturing.
What is lean manufacturing?
The definition of lean manufacturing, taken literally, refers to the philosophy of “lean” production management. The word “lean” means “slim” or “streamlined,” which perfectly captures the idea of a manufacturing company operating efficiently—without unnecessary processes and activities. The goal of lean manufacturing is therefore to eliminate waste in various areas of the organization’s operations while maintaining high product quality.
The lean manufacturing system focuses on organizing processes in a way that enables:
- a smooth workflow,
- the elimination of production waste,
- and the rapid identification of problems.
Eliminating waste in production means reducing anything that generates costs, extends lead times, or lowers plant efficiency. It is worth noting that waste elimination in lean manufacturing should not be equated solely with cost reduction. The lean philosophy assumes that in manufacturing companies, a significant portion of the activities carried out each day adds no value for the customer. These may include downtime, overproduction, unnecessary movement of materials, or disrupted information flow. From the customer’s perspective, value lies solely in what they are actually willing to pay for. All other activities should be minimized or eliminated entirely.
The philosophy of lean manufacturing is therefore about creating an environment in which organized and predictable processes enable the delivery of the highest-quality product with the minimum necessary effort and resources.
Where does the concept of lean manufacturing come from?
The origins of lean manufacturing can be traced back to Japan and the period following World War II. It was then that Toyota began developing the innovative Toyota Production System (TPS).
Sakichi Toyoda, Kiichiro Toyoda, and Taiichi Ohno were responsible for developing the Toyota Production System. Initially, the company operated in the textile industry. Sakichi Toyoda developed automatic looms that stopped the machine when a thread broke, which helped reduce human error and improve efficiency.
After Kiichiro Toyoda visited Ford’s American factories, the company shifted its focus to the automotive industry. Toyota needed a more flexible system, so it began developing solutions related to automation and quality control. Taiichi Ohno played a huge role in the process of eliminating waste by observing the work of operators and machines. He identified the main sources of waste, which include overproduction, waiting, unnecessary transportation, and excess inventory. Based on this, a system was created focused on eliminating waste, standardizing processes, and improving workflow. This system became the foundation of modern lean manufacturing.
What are the main principles of lean manufacturing?
The principles of lean manufacturing form the foundation of effective production process management. These include:
- Defining customer value
- Mapping the value stream
- Creating a smooth process flow
- Pull system – production on demand
- Continuous improvement
Defining value for the customer
The first principle of lean manufacturing requires identifying what constitutes true value for the customer. It is important to remember that not every activity carried out within a company will be considered valuable.
Above all, the customer expects:
- adequate quality,
- timeliness,
- reliability,
- and competitive pricing.
All activities that do not impact these elements should be analyzed to determine whether they are necessary. Processes that generate costs without affecting the final product include, among others, excessive reporting, multi-level approvals, and data duplication.
Value Stream Mapping
The second principle is value stream mapping, which involves a detailed analysis of the flow of materials and information within an organization.
Value Stream Mapping allows you to see:
- what the entire production process looks like,
- where bottlenecks occur,
- which activities generate waste,
- where downtime occurs,
- how long it takes to complete each operation.
Creating a smooth workflow
The third principle of lean manufacturing is to create a smooth process flow. It assumes that the process should run smoothly, without unnecessary stops or disruptions.
In practice, this means:
- minimizing queues between operations,
- reducing downtime,
- shortening changeover times,
- eliminating unnecessary transport,
- and synchronizing activities between workstations.
Pull system – on–demand production
The pull principle, or production on demand, refers to initiating activities only when there is an actual need. This is the opposite of the traditional push model, in which production is based on forecasts and long-term plans.
The pull system:
- limits overproduction,
- reduces inventory,
- improves material flow,
- increases control over the process,
- shortens order fulfillment times.
Continuous improvement (Kaizen)
The final principle of lean manufacturing is continuous improvement, or kaizen. The kaizen philosophy holds that every process can be continuously improved. Importantly, these are not one-time overhauls, but small, regular improvements implemented every day.
A culture of continuous improvement includes:
- analyzing problems,
- involving teams in the improvement process,
- submitting ideas for improvements,
- standardizing best practices,
- continuously monitoring metrics and making further improvements.
What types of waste does lean manufacturing eliminate?
In lean philosophy, waste is referred to as “muda,” or useless activities. The classic lean model identifies seven basic types of waste:
What lean manufacturing tools are used in production?
The creators of the lean manufacturing concept built Toyota’s production system around solutions designed to eliminate waste and improve quality. It was then that lean manufacturing tools were developed, forming the foundation of the current approach to lean production management. What lean manufacturing methods support this systematic approach?
- 5S. This method of workplace organization is based on five principles: sorting, organizing, cleaning, standardizing, and self–discipline. Organizing and ergonomically arranging the work environment speeds up work and improves employee safety.
- Kanban. A Kanban board enables the control of material flow and production in line with actual demand, based on visual signals. Kanban improves workflow efficiency and enhances control over process execution.
- Just–in–Time. This production method involves delivering materials and completing tasks exactly when they are needed. Just–in–time production helps reduce inventory levels and shorten process lead times.
- Kaizen. The concept of continuous improvement is based on the regular implementation of small organizational and process improvements. The Kaizen system calls for the active involvement of all employees in identifying problems and proposing changes that improve work efficiency.
- SMED. This method for reducing machine changeover times involves analyzing the changeover process. The process transformation includes converting external activities into internal ones and implementing improvements that allow machines to be changed over in the shortest possible time.
- Poka–Yoke. This safety system prevents errors from occurring during the production process. Sensors, interlocks, structural components, and other measures prevent operations from being performed incorrectly, thereby reducing the number of errors.
- Value Stream Mapping. This method enables the analysis of the flow of materials and information within an organization. It helps identify bottlenecks, downtime, and activities that do not add value for the customer.
What are the benefits of implementing lean manufacturing?
Lean manufacturing streamlines production processes, reduces waste, and improves the utilization of available resources. The stability and predictability of processes facilitate production planning and help reduce order lead times. Eliminating downtime, overproduction, and quality defects increases production profitability. The capacity gained through optimization can thus be better utilized – more company resources mean greater capacity to fulfill subsequent orders.
How can you implement lean manufacturing in your company?
The noSilo platform is a digital lean management tool that helps companies manage their employees. How can this solution be used to implement lean methods in manufacturing?
Identifying skills gaps
The noSilo system features intelligent competency matrices that enable quick identification of areas requiring improvement. Clear charts allow you to determine the current competency level of individual employees and entire teams at a glance. Efficient identification of competency gaps and proper management of onboarding and training eliminate waste associated with downtime, errors, and untapped staff potential.
Employee involvement in the continuous improvement process
The noSilo platform offers an intuitive system for employees to submit kaizen suggestions. The tool allows employees to submit proposals for changes, and suggestions can be implemented directly within the application. As a result, the company can gather insights from experienced employees, build a database of best practices, and foster a culture of continuous improvement, thereby avoiding losses resulting from reduced employee motivation and engagement.
Smooth flow of information
noSilo eliminates information silos through its internal communication management tools. The system enables the efficient exchange of information and the delivery of messages to authorized personnel. Instant access to information boosts employee productivity and reduces errors and delays caused by communication issues.
Autonomous machine maintenance
noSilo helps companies achieve their TPM goals through features related to autonomous machine maintenance. The system allows users to create checklists assigned to specific machines, along with specified inspection frequencies. Employees can easily confirm machine operational status, report issues, and forward information to the maintenance department. Increased machine availability translates to reduced downtime and breakdowns, as well as optimized maintenance costs.
Lean manufacturing is essential for eliminating waste, improving process organization, and building a stable production environment. noSilo supports the development of a lean culture within a company through tools that standardize employee skill development, manage kaizen suggestions, facilitate autonomous machine maintenance, and ensure the flow of information between teams.
Bibliography:
https://mfiles.pl/pl/index.php/Lean_manufacturing;
https://www.toyota.pl/swiat-toyoty/o-toyocie/wizja-i-filozofia-toyoty/system-produkcyjny-toyoty;
https://oficyna.prz.edu.pl/fcp/RGBUKOQtTKlQhbx08SlkTUARLUWRuHQwFDBoIVURNWHlaFVZpCFghUHcKVigEQUw/18/public/otwarty-dostep/2021/stadnicka-kompendium-wiedzy-lm3.pdf;
https://www.researchgate.net/publication/266535454_Metody_i_narzedzia_Lean_Manufacturing.
She has many years of experience in the manufacturing environment, gained both in team management and in the coordination of internal processes. Her practical experience in operational and managerial work has given her a deep understanding of the challenges faced by managers and production employees – from work standardization and communication to competence development.
This experience forms the foundation on which she bases her current expert activity. In her articles, she shows how digital solutions and modern management methods can realistically support the daily work of production plants, making processes more transparent, orderly, and effective.
