1. INTRODUCTION TO QUALITY
CONTROL
By… Vinaya Bandla

2. Quality
General : Measure of excellence or state of being free from defects
and deficiencies
Manufacturing : Strict and consistent adherence to measurable and
verifiable standards to achieve uniformity of output that satisfies
specific customer or user requirements.
For example:
 Bike needs periodic check up!!
 Senior citizen needs regular health check up!!
2

3. Quality Characteristics
 Structural Characteristics
 Sensory Characteristics
 Time-oriented Characteristics
 Ethical Characteristics
3

4. Variables and Attributes
Variables: Expressed on numerical scale
Eg: Thickness of washers are 2+0.1 mm
Attributes: Either confirming or non-confirming to a stipulated
specification
Eg: color of fabric , smell of perfume
Defect
 Does not meet standards
 Unacceptable or defective
 Modern term Nonconformity
4

5. Specification
 Set of conditions and requirements
 Detailed description of the procedure , process ,material ,
product
 Standard may be included or referred
Standard
 Does not meet standards
 Unacceptable or defective
 Modern term Nonconformity
5

6. Quality of Design
 Quality of Design
Product or service must be designed to meet at least minimal needs of the
consumer
 Quality of Conformance
Manufactured Product or service rendered must meet the standards selected in
design phase
 Quality of Performance
How well the product functions or service performs when put to use
6

7. Quality Control
A system that is used to maintain a desired
level of quality in a product or a service
3 Subareas:
 Off-Line Quality Control
 Statistical Process Control
 Acceptance Sampling Plans
7

8. Off-Line Quality Control
Measures to select and choose controllable product and process
parameters – Deviation is minimized
Statistical Process Control
Comparing the output with standard and taking remedial
actions
For example:
Paperwork errors in an administrative department
8

9. On-line Statistical Process Control
Information gathered about product, process or service while its
functional.
 Corrective actions on real-time basis
 Brings system to acceptable state
Acceptance Sampling Plans
The number of items to sample and acceptance criteria of the lot,
based on meeting certain stipulated conditions
Eg: Batch of 500,sample size 50,acceptance no is 3
9

10. Quality Assurance
All those planned or systematic actions necessary to
provide confidence that a product will satisfy given
needs
Eg: The product design level by surveying the procedures
used in design
10

11. Quality circles
 Consists of group of operators , supervisors, mangers and so on
 To improve ways to make product
 Effective productivity improvement tool
 Actively involved in decision-making process
Quality Improvement Team
 Identifying feasible solutions
 Cross functional in nature-advantage
 Formation of team and its leaders
 Regular feedback on results and actions taken
11

12. Benefits of Quality Control






12
Improvement in the quality of products
System is continually evaluated and modified
Improves productivity
Reduces costs on long run
Lead time of producing parts and subassemblies is reduced
Maintain improved environment

13. Thank You
By… Vinaya Bandla
13