As said in an earlier article, ISO does not itself certify organizations or the bodies which certify.
Organizations are certified by the Certification bodies. These Certification bodies are authorized by the accreditation bodies  of the country to audit the  organizations applying for ISO 9001 compliance certification. The various accreditation bodies have mutual agreements with each other to ensure that certificates issued by one of the Accredited Certification Bodies (CB) are accepted worldwide.
Although commonly referred to as ISO 9000:2000 certification, the actual standard to which an organization’s quality management can be certified is ISO 9001:2008. The applying organization is assessed based on an extensive sample of its sites, functions, products, services and processes; a list of problems (“action requests” or “non-compliance”) is made known to the management. If there are no major problems on this list, or after it receives a satisfactory improvement plan from the management showing how any problems will be resolved, the body will issue an ISO 9001 certificate for each geographical site it has visited.
An ISO certificate is not a once-and-for-all award, but must be renewed at regular intervals recommended by the certification body, usually around three years.
There are no grades of competence within ISO 9001: either a company is certified (meaning that it is committed to the method and model of quality management described in the standard), or it is not
Both the accreditation bodies and the certification bodies charge fees for their services. Various charges paid by the organization audit fees, surveillance audit fees, re certification audit fees.
In fact, ISO itself advises that ISO 9001 can be implemented without certification, simply for the quality benefits that can be achieved.
ISO 9001 is not in any way an indication that products produced using its certified systems are any good. A company can intend to produce a poor quality product and providing it does so consistently and with the proper documentation can put an ISO 9001 stamp on it.
form the above it can be observed that the certification of ISO 9001 compliance does not guarantee the product quality. It simply means that the organization has a quality management system, which is in conformance of the ISO 9001 Standard and implemented the QMS which is good for producing a good quality product.
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