Difference Between Quality Control & Quality Assurance

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  • 8/4/2019 Difference Between Quality Control & Quality Assurance


    http://iso-qms.blogspot.com/Mohammad Jaid Alam

    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


    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


    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

  • 8/4/2019 Difference Between Quality Control & Quality Assurance


    http://iso-qms.blogspot.com/Mohammad Jaid Alam

    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.

  • 8/4/2019 Difference Between Quality Control & Quality Assurance


    http://iso-qms.blogspot.com/Mohammad Jaid Alam

    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


    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


    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

  • 8/4/2019 Difference Between Quality Control & Quality Assurance


    http://iso-qms.blogspot.com/Mohammad Jaid Alam

    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.


    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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