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Difference between Quality Assurance and Quality Control
ISO 9000- Definition Quality Control: A part of quality
management focused on fulfilling quality requirements.
Quality Assurance: A part of quality management focused on
providing confidence that quality
requirements will be fulfilled.
Quality Control UWhatU: The activities or techniques used to
achieve and maintain the product quality,Process and
service.
UHowU: Finding & eliminating causes of quality problems
through tools & equipment so That customers
requirements are continually met.
Quality Assurance UWhatU: Prevention of quality problems through
planned and systematic activities including
documentation.
UHowU: Establish a good quality management system and the
assessment of its adequacy & conformance
audit of the operation system & the review of the system
itself.
Quality Control just measures and determines the quality level
of products or services. It is a
process itself.
Quality Assurance is a complete system to assure the quality of
products or services. It is not only
a process, but a complete system including also control. It is a
way of management
Quality Control is the process involved within the system to
ensure job management, competence
and performance during the manufacturing of the product or
service to ensure it meets the Quality
plan as designed.
Quality Assurance is a system for evaluating performance,
service, of the quality of a product
against a system, standard or specified requirement for
customers.
Article 1
By the end of the Second World War, mass production of various
kinds of products was
at its peak. Manufacturing companies have begun to produce
different kinds of products
that are then sold to the public in large quantities. As a
result, there had been also an
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increase in the number of defective products that were sold in
the market. To minimize
this, a shift was done within business organizations in order to
give more importance to
the quality of the products that are manufactured and sold. Even
today, business
organizations, regardless of their size, give importance to the
quality of the products andservices that they provide their
customers above everything else.
More often than not, the terms quality assurance and quality
control have been
interchanged. But actually, these refer to two different
concepts. Quality control focuses
more on failure detection. It comprises various methods, systems
and strategies in order
to determine certain areas which are below the expectations and
standards of the
company to its products and services. Quality control aims to
answer the question what
went wrong? and what can be done to remedy it?
On the other hand, quality assurance pertains to the processes
and procedures which
aim to foresee any potential failure that may occur in order to
prevent this from
happening even before it happens. Quality assurance procedures
and methodologies are
often provided during the planning stage and conceptualization
stage of a particular
product or service in order to determine its feasibility and
profitability. Quality
assurance encompasses all the potential threats towards the
product and service that
may arise in the future, particularly when it comes to product
safety, legal matters and
the like. Quality control is a part of quality assurance in the
sense that they determine
what the potential problems that can happen, and how these
problems may be properly
address to minimize its impact to the business organization as a
whole.
Between the two, business organizations tend to focus more on
quality assurance as
opposed to quality control. This is in order to prevent any loss
of income that can be
incurred by the business organization and the increase in the
expenses that will be
generated as a result of remedying the problems that arose as a
result of launching a
particular product or service. It is for this reason why
business organizations take some
time before they launch a new product or add a new service
feature to their current list
of products and services.
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Article 2
Whether it is a product, process, service or a system, quality
is of paramount
importance. Quality control, and quality assurance are two terms
that are often
encountered in any organization and people are often confused by
the difference
between these two terms. Though closely related, and basically
concerned with quality,
these are different approaches taken for achieving similar ends.
This article will
highlight the features of quality assurance and quality control
to enable to appreciate the
terms in a better manner.
While quality control is a set of activities designed to
evaluate a developed product,
quality assurance or guarantee pertains to activities that are
designed to ensure that the
development and maintenance process is adequate and the system
meets its objectives.
Quality control focuses on finding defects or anomalies in the
deliverables and checking
if the defined requirements are the right requirements. Testing
is one example of a
quality control activity, but there are many more such
activities that make up quality
control.
Quality assurance ensures that the process is well defined and
appropriate. Someexamples of quality assurance are methodology and
standards development. Any quality
assurance review would typically focus on the process aspect of
a project or task, for
example, are requirements being defined at a level of detail
that is accepted and proper.
The most notable difference between quality assurance and
quality control is that while
QC is product oriented, QA is process oriented. Since testing
checks the quality of a
product, it classifies in the domain of QC. When you are testing
a product for quality,
you are not assuring its quality, you are controlling it.
Another differentiation between
QA and QC is that while QA makes sure that what you are doing
are right things in the
right manner while QC ensures that the results of what you have
done are as per your
expectations.
The difference between QA and QC is also one of power and
control. QC is under control
of development while QA controls development. QA normally
precedes QC. QA is
undertaken before starting a project whereas QC begins once the
project has been
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completed. During QA, requirements of customers are defined
while during QC, the
product is tested to ensure it meets the quality set out
initially. As such, QA is a proactive
or preventive measure to avoid defects whereas QC is a
corrective measure to identify
any defects so as to correct them.
Summary
However, both QC and QA are highly interdependent. The QA
department relies largely
on the feedback it receives from the QC department. If there are
any problems, the same
are conveyed by QC department to QA department which makes
suitable changes in the
process so as to avoid these problems in future.
For Article on Quality visit my blog
Both quality assurance and quality control have same objective
but they differ in
approaches and style. They are strongly interdependent which
makes it difficult to
pinpoint the differences. To make matters worse, in some
organizations, both functions
are performed by a single department.
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Link to Previous Articles
1. What is ISO 9000?
2. Quality Glossary A to Z
3. The Quality Control Audit - By Kaoru Ishikwa
4. The eight principles of quality management
5. Executive Summary of the 14 Toyota Way Principles
6. Toyota Production System
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