Control charts are graphical representations used to monitor quality characteristics of a process over time. They detect variations in production processes and warn of any deviations from tolerance limits. The main types of control charts are variable charts, used for continuous measurements like height or weight, and attribute charts, used for characteristics measured as attributes like defects. Variable charts are more detailed and informative but also more expensive than attribute charts. Control charts have advantages like indicating whether a process is in control and reducing scrap.

1. Control Charts
Group Members:-
Sneha Dasouni (201810702110034)
Sonali Sharma (201810702110035)
Shikhar Mehrotra (201810702110036)
Abhay Agrahari (201810702110037
Course:- BBA
Year/ Semester:- 2nd / 3rd
Subject:- Operations Management

2. INDEX
• What is a Control Chart ?
• What do these charts do ?
• Its advantages and purposes.
• Types of Control Charts.
• Comparison of Variable and Attribute Charts.
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3. What is a Control Chart ?
• Graphical representation of
the collected information.
• Pertains to the measured
quality characteristics.
• Graph used to study how a
process changes over time.
• Data are plotted in time order.
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4. What do these Charts Do ?
• Detects variations in the
production process .
• Warns if there is any deviation
from the specified tolerance
limits.
• Primarily a diagnostic technique.
• Depicts if there is any change on
the characteristics of items since
the start of the production.
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5. Advantages of Control Charts
• It indicates whether a process
is in control or out of control.
• It ensures product quality
level.
• It warns rectification in time
and scrap percentage can be
reduced.
• It provides information about
the selection of process.
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6. Types of Control Charts 5

7. Variable Charts
• Used to evaluate variation in a
process where the measurement is
a variable.
• Variable measurement means
the variable can be measured on a
continuous scale (e.g. height,
weight, length, concentration).
• The two main types of variable
charts are:- (i) X- bar (ii) R- bar
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9. Attribute Charts
• Used to evaluate variation where the
measurement is an attribute.
• These charts come into picture where
the colour , number of spots etc. are to
be considered.
• There are two types of Attribute
charts:-
(i) Binomial distribution (e.g. p, np-
chart)
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11. Variable and Attribute Charts
(Comparison)
• Variable charts involve the measurement of the job dimensions
whereas an attribute chart only differentiates between a
defective item and a non-defective item.
• Variable charts are more detailed and contain more information
as compared to attribute charts.
• Attribute charts is based on ‘GO and NO GO’ data but variable
chart also rectifies the problem.
• Variables charts are expensive in comparison to attribute
charts.
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