The document discusses quality control concepts and processes. It introduces common quality control frameworks like the Juran Trilogy, PDCA cycle, feedback loops, and the pyramid of control. It distinguishes between quality control and quality assurance. Planning is a key part of quality control - it involves understanding customer needs, defining control responsibilities, using tools like flow diagrams to plan inspection points, and determining who will do the planning. The overall goal of quality control processes is to maintain stability and meet customer requirements.
2. Introduction
• Quality control is a universal managerial process
for conducting operations so as to provide
stability—to prevent adverse change and to
“maintain the status quo.”
• Function:
▫ evaluates actual performance
▫ compares actual performance to goals
▫ takes action on the difference
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3. Juran Trilogy
Fig 1. The Juran trilogy Diagram
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4. QC v/s QA
Quality Control Quality Assurance
• Evaluates performance
• Compares performance to
goals
• Maintains control
• Evaluates performance
• Compares performance to
goals
• Verifies that control is being
maintained
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5. Quality Control Concepts
• Feedback loop
• Process capability
• Self-control
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6. Feedback loop
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Fig 2 . The generic Feedback loop
7. Elements of Feedback Loop
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Fig 3. The Quality control process
8. Self Control
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Fig 4. Self Control
9. The PDCA Cycle
• Also called Deming wheel and Shewhart cycle
▫ Plan: includes choosing control subjects and
setting goals
▫ Do: includes running the process
▫ Check: includes sensing and umpiring
▫ Act: includes stimulating the actuator to take
corrective action
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10. The PDCA Cycle
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Fig 5.The PDCA Cycle
11. The Pyramid of control
Control by
Managers,
Supervisors
Control by the Work Force
Automated Controls
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Control
by Upper
Managers
Fig 6 . The Pyramid of control
12. Contrast of Quality Control
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Table 1. Contrast of Quality Control at Two Levels—Work Force and Upper
Management
13. Planning for Quality Control
• Planning for control is the activity which provides the
system—the concepts, methodology, and tools—through
which company personnel can keep the operating
processes stable and thereby produce the product
features required to meet customer needs
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14. The Customers and Their Needs
• The company personnel engaged in control
• carry out the steps which form the feedback loop
• Such personnel require
▫ an understanding of customers’ quality needs
▫ a definition of their own role in meeting those
needs
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15. Planning for Quality Control
• helps to bridge that gap
• provides operating personnel with information on
customer needs (whether direct or translated) and
definition of the related control responsibilities of the
operating personnel.
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16. Planning for Quality Control
Who plans?
• Staff planners who also plan operating processes
• Staff quality specialists
• Multifunctional teams of planners and operating
personnel
• Departmental managers and supervisors
• Work force
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17. Quality Control Concepts
• Flow diagram- helps the planning team to
understand the overall operating process
• Control stations- area in which quality control
takes place
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18. Quality Control Concepts
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Fig 7 .The Flow Diagram
19. Bibliography
• Joseph M. Juran, A. Blanton Godfrey (1998),
Juran’s Quality handbook, 5th edition, McGraw-
Hill
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