Top 25 Lean Tools

Exploring The World Of Lean

There are a lot of great ideas to explore in lean. So where should you begin?

One way to start is to survey the most important lean tools, with a brief description and short explanation of how each tool can improve your manufacturing operations.

If a tool captures your interest or resonates with you in some way – explore it further to decide if it is something to pursue now…or later. Many of these tools can be successfully used in isolation, which makes it much easier to get started. On the other hand, the benefits will compound as more tools are used, as they do support and reinforce each other.

25 Essential Lean Tools

The following is a collection of 25 essential lean tools. Each tool is distilled into a simple description of what it is and how it helps.

Lean ToolWhat Is It?How Does It Help?
5S Organize the work area:
  • Sort (eliminate that which is not needed)
  • Set In Order (organize remaining items)
  • Shine (clean and inspect work area)
  • Standardize (write standards for above)
  • Sustain (regularly apply the standards)
Eliminates waste that results from a poorly organized work area (e.g. wasting time looking for a tool).
Andon Visual feedback system for the plant floor that indicates production status, alerts when assistance is needed, and empowers operators to stop the production process. Acts as a real-time communication tool for the plant floor that brings immediate attention to problems as they occur – so they can be instantly addressed.
Bottleneck Analysis Identify which part of the manufacturing process limits the overall throughput and improve the performance of that part of the process. Improves throughput by strengthening the weakest link in the manufacturing process.
Continuous Flow Manufacturing where work-in-process smoothly flows through production with minimal (or no) buffers between steps of the manufacturing process. Eliminates many forms of waste (e.g. inventory, waiting time, and transport).
Gemba (The Real Place) A philosophy that reminds us to get out of our offices and spend time on the plant floor – the place where real action occurs. Promotes a deep and thorough understanding of real-world manufacturing issues – by first-hand observation and by talking with plant floor employees.
Heijunka (Level Scheduling) A form of production scheduling that purposely manufactures in much smaller batches by sequencing (mixing) product variants within the same process. Reduces lead times (since each product or variant is manufactured more frequently) and inventory (since batches are smaller).
Hoshin Kanri (Policy Deployment) Align the goals of the company (Strategy), with the plans of middle management (Tactics) and the work performed on the plant floor (Action). Ensures that progress towards strategic goals is consistent and thorough – eliminating the waste that comes from poor communication and inconsistent direction.
Jidoka (Autonomation) Design equipment to partially automate the manufacturing process (partial automation is typically much less expensive than full automation) and to automatically stop when defects are detected. After Jidoka, workers can frequently monitor multiple stations (reducing labor costs) and many quality issues can be detected immediately (improving quality).
Just-In-Time (JIT) Pull parts through production based on customer demand instead of pushing parts through production based on projected demand. Relies on many lean tools, such as Continuous Flow, Heijunka, Kanban, Standardized Work and Takt Time. Highly effective in reducing inventory levels. Improves cash flow and reduces space requirements.
Kaizen (Continuous Improvement) A strategy where employees work together proactively to achieve regular, incremental improvements in the manufacturing process. Combines the collective talents of a company to create an engine for continually eliminating waste from manufacturing processes.
Kanban (Pull System) A method of regulating the flow of goods both within the factory and with outside suppliers and customers. Based on automatic replenishment through signal cards that indicate when more goods are needed. Eliminates waste from inventory and overproduction. Can eliminate the need for physical inventories (instead relying on signal cards to indicate when more goods need to be ordered).
KPI (Key Performance Indicator) Metrics designed to track and encourage progress towards critical goals of the organization. Strongly promoted KPIs can be extremely powerful drivers of behavior – so it is important to carefully select KPIs that will drive desired behavior. The best manufacturing KPIs:
  • Are aligned with top-level strategic goals (thus helping to achieve those goals)
  • Are effective at exposing and quantifying waste (OEE is a good example)
  • Are readily influenced by plant floor employees (so they can drive results)
Muda (Waste) Anything in the manufacturing process that does not add value from the customer’’s perspective. Eliminating muda (waste) is the primary focus of lean manufacturing.
Overall Equipment Effectiveness (OEE) Framework for measuring productivity loss for a given manufacturing process. Three categories of loss are tracked:
  • Availability (e.g. down time)
  • Performance (e.g. slow cycles)
  • Quality (e.g. rejects)
Provides a benchmark/baseline and a means to track progress in eliminating waste from a manufacturing process. 100% OEE means perfect production (manufacturing only good parts, as fast as possible, with no down time).
PDCA (Plan, Do, Check, Act) An iterative methodology for implementing improvements:
  • Plan (establish plan and expected results)
  • Do (implement plan)
  • Check (verify expected results achieved)
  • Act (review and assess; do it again)
Applies a scientific approach to making improvements:
  • Plan (develop a hypothesis)
  • Do (run experiment)
  • Check (evaluate results)
  • Act (refine your experiment; try again)
Poka-Yoke (Error Proofing) Design error detection and prevention into production processes with the goal of achieving zero defects. It is difficult (and expensive) to find all defects through inspection, and correcting defects typically gets significantly more expensive at each stage of production.
Root Cause Analysis A problem solving methodology that focuses on resolving the underlying problem instead of applying quick fixes that only treat immediate symptoms of the problem. A common approach is to ask why five times – each time moving a step closer to discovering the true underlying problem. Helps to ensure that a problem is truly eliminated by applying corrective action to the “root cause” of the problem.
Single Minute Exchange of Die (SMED) Reduce setup (changeover) time to less than 10 minutes. Techniques include:
  • Convert setup steps to be external (performed while the process is running)
  • Simplify internal setup (e.g. replace bolts with knobs and levers)
  • Eliminate non-essential operations
  • Create standardized work instructions
Enables manufacturing in smaller lots, reduces inventory, and improves customer responsiveness.
Six Big Losses Six categories of productivity loss that are almost universally experienced in manufacturing:
  • Breakdowns
  • Setup/Adjustments
  • Small Stops
  • Reduced Speed
  • Startup Rejects
  • Production Rejects
Provides a framework for attacking the most common causes of waste in manufacturing.
SMART Goals Goals that are: Specific, Measurable, Attainable, Relevant, and Time-Specific. Helps to ensure that goals are effective.
Standardized Work Documented procedures for manufacturing that capture best practices (including the time to complete each task). Must be “living” documentation that is easy to change. Eliminates waste by consistently applying best practices. Forms a baseline for future improvement activities.
Takt Time The pace of production (e.g. manufacturing one piece every 34 seconds) that aligns production with customer demand. Calculated as Planned Production Time / Customer Demand. Provides a simple, consistent and intuitive method of pacing production. Is easily extended to provide an efficiency goal for the plant floor (Actual Pieces / Target Pieces).
Total Productive Maintenance (TPM) A holistic approach to maintenance that focuses on proactive and preventative maintenance to maximize the operational time of equipment. TPM blurs the distinction between maintenance and production by placing a strong emphasis on empowering operators to help maintain their equipment. Creates a shared responsibility for equipment that encourages greater involvement by plant floor workers. In the right environment this can be very effective in improving productivity (increasing up time, reducing cycle times, and eliminating defects).
Value Stream Mapping A tool used to visually map the flow of production. Shows the current and future state of processes in a way that highlights opportunities for improvement. Exposes waste in the current processes and provides a roadmap for improvement through the future state.
Visual Factory Visual indicators, displays and controls used throughout manufacturing plants to improve communication of information. Makes the state and condition of manufacturing processes easily accessible and very clear – to everyone.