Page 171 - DMGT501_OPERATIONS_MANAGEMENT

Unit 6: Quality Assurance and Control

Notes
Static Standard Control Limits
UCL LCL

C C C + 3 C – 3
where = C

Having determined C, the Control limit can be directly read from the chart.

Advantages of Control Charts

There are numerous advantages of the Control charts. The alphabets of the ‘Control Charts’
itself can be used to highlight the advantages of Control Charts:
C Controls the process (at desired Economic levels).
O Optimises technical resources (as it provides the information) as to take remedial action).
N Narrows the heterogenecity (among units of a product).
T Traces differences among Operators, Supervisors, Machines etc.
R Reduces cost of Inspection.
O Overhauling and maintenance of machines, indicated whenever necessary.

L Leads to the detection of inspection errors.
C Creates quality consciousness.
H Histories the process at a glance.
A Acceptability of the product by consumer is enhanced.
R Reduces waste of materials.
T Trains the Operator and improves his skill.
S Standardises the stage processes.

6.6 Emphasis from Quality Control to Quality Assurance

“Quality is never by an accident,
It is always the result of an intelligent effort”.
– John Ruskin
“Quality is never by an accident,

It has always to be pre-planned”.
– Juran
The quest for efficiency is eternal to mankind. In industrial parlance, efficiency means maximising
production of quality products at optimal cost.
Quality has been defined in different ways by different persons, such as:
1. Degree of Excellence
2. Life of Product
3. Cost of Product

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