Six Sigma and Lean Management Principles

Six Sigma

  • Quality management method focused on reducing defects and improving efficiency.
  • Objective: Achieve 99.9997% accuracy (3.4 defects per million opportunities).
  • Principles:
    • Customer Focus
    • Data-Driven Decision Making
    • Process Improvement
    • Employee Involvement
    • Continuous Improvement
  • DMAIC Process:
    • Define
    • Measure
    • Analyze
    • Improve
    • Control
  • Tools: Flowcharts, Scatter Diagrams, Cause-and-Effect Diagrams, Pareto Charts, Statistical Process Control.

Six Sigma vs Three Sigma

  • Three Sigma: ≈\approx 2,700 defects per million (99.73% accuracy).
  • Six Sigma: 3.4 defects per million (99.9997% accuracy).

Process Improvement Plan

  • Identify the Problem
  • Measure the Current Process
  • Analyze the Root Causes
  • Improve the Process
  • Control for Long-Term Success

Lean Management

  • Delivers what customers want, when they want it, with no waste, through continuous improvement.
  • Objective: Remove waste to strive for perfection.
  • 7 Wastes: Overproduction, Queues, Transportation, Inventory, Motion, Overprocessing, Defective product.
  • 5'S Methodology:
    • Sort (Seiri)
    • Set in order (Seiton)
    • Shine (Seiso)
    • Standardize (Seiketsu)
    • Sustain (Shitsuke)

Lean and Just-in-Time (JIT)

  • Ensures materials arrive just in time, reducing waste and inventory.
  • Develops buyer-supplier collaboration.

Supplier Partnerships

  • Work together with open communication to remove waste and reduce costs.
  • Remove unnecessary activities and in-plant inventory.

Managing Operations

  • Reduce in-transit inventory with nearby suppliers and frequent smaller shipments.
  • Consignment Inventory: Suppliers keep ownership until materials are used.
  • Improve quality through long-term commitments and cooperation.

Lean Layouts

  • Reduce movement by placing materials where needed.
  • Key Tactics: Distance Reduction, Increased Flexibility, Employee Impact, Reduced Space & Inventory.

Lean Inventory

  • Keeps only necessary supplies on hand.
  • Reducing Lot Sizes: Lowers inventory levels and costs.

Lean Inventory Formula

  • Q=2DSH[1−(d/p)]Q = \sqrt{\frac{2DS}{H[1-(d/p)]}}
    • Where:
      • DD = Annual demand
      • SS = Setup cost
      • HH = Holding cost
      • dd = Daily demand
      • pp = Daily production

Lean Scheduling

  • Improves order fulfillment and reduces inventory. Freezing Strategy and Kanban system.

Lean Quality

  • Reduces scrap, rework, and excess stock.

Continuous Improvement

  • Kaizen promotes a continuous improvement culture.

Lean Organizations

  • Focus on customer expectations and collaboration.
  • Strong leadership is necessary.

Building a Lean Organization

  • Respect & Develop Employees, Empowerment, Worker Flexibility, Process Perfection, Supplier Collaboration, Eliminate Waste.

Lean and Sustainability

  • Maximize economic and resource efficiency.
  • Lean: removes waste because waste adds nothing for the customer
  • Sustainability: removes waste because it is costly and harmful to the environment.

Lean in Services

  • Applies to service sectors, focusing on customer interaction and employee empowerment.
  • Key applications: Suppliers (JIT), Layouts (optimized spaces), Inventory (minimal stock levels), Scheduling (precise staffing).