About Quality

What is quality assurance?

All those planned or systematic actions necessary to provide adequate confidence that a product or service will satisfy given requirement for quality (BS 4778 : Part 1).

Aim of Quality Assurance

The aim of quality assurance is to improve quality whilst keeping cost to an acceptable level.

The objective of a system used to implement quality assurance , i.e. a quality system, is to determine and rectify the root cause(s) of any problems, thereby reducing faults and wastage. This will in turn, improve quality and reduce cost. The emphasis is on prevention rather than detection and cure.

Benefits of adopting quality assurance

A properly implemented and managed quality system should:

a. Help to ensure that the company focuses on market needs and requirement.

b. Make the company more competitive in the market place due to an increased customer confidence in the company output, i.e. a product or service that the customer wants-this include timing .

c. Lead to reduction of cost due to reduced number of faults and wastage.

d. give a measure of performance which will enable any areas for improvements to be identified.

e. induce a more organized way of thinking which makes management more organized and effectively.

f. Provide motivation; motivated employees provide a better working environment in addition to the product or service output benefits.

Scope of quality assurance

Quality assurance should encompass all parts of an organization and all phases of an activity i.e. Planning, design, production, maintenance, administration etc. Collaboration with suppliers and purchasers should also be part of an organization’s quality system.

Quality Assurance, Quality Control & Inspection

Quality assurance is not inspection. Inspection is one of the important elements within a system for quality assurance which require continuing evaluation in the same way as the other elements, e.q. planning,, design/specification, production, etc.

Inspection is activities such as measuring, examining, testing, gauging one or more characteristics of a product or service and comparing these with the specified requirements to determine the conformity (BS 4778 : Part 1)

Quality control is the operational techniques and activities that are used to fulfill requirements for quality (BS 4778: Part 1). This definition can be vague, so modifying the term to be more specific is advantageous, e.g. manufacturing quality control is more explanatory.

Quality control is involved with the monitoring of a process and eliminating the cause of any deficient output with any process, or any phase during a contract, which has an effect on quality. The information obtained from inspection, as defined above, is used for quality control.

Quality control deal with the actual measurement of quality performance which is compared against what is required and action is taken on the different. Quality control is asking the question. “is the work/ action being performed correctly??

Quality control does not reach all elements which affect quality, e.g. quality control will rarely do anything to correct problem relating to management, traceability, training and staff motivation.

Quality assurance applies to all areas which has an effect on quality, and ask the question, ;has the work/action been performed correctly”? This question can only be asked after information has been obtained from quality control and all other department/areas which  effect quality.

Quality Policy

Is the overall quality intentions and direction of an organization as regard quality, as formally expressed by top management.

The company policy on quality within an organization must be decided before a quality systems is documented or managed. Quality systems may very widely between different organization because of different quality objectives, different scope of work and different methods of working. 

Quality systems

Quality systems is the organizational structure, responsibilities, procedures, process and resources for implementing quality management.

A quality system within a organization is implemented by the use of written procedures which cover all those aspect which govern the final quality of a product or services. The quality manual is a document in which the quality system is referred to as a whole. Reference is made the quality manual to the relevant procedures to be used to implement the system.

Quality systems and associated documentation should ideally be:

  1. Simple
  2. Logical
  3. Clear
  4. Complete
  5. Concise
  6. Correct
  7. User friendly

A quality system shall produce records reflecting the true situation regarding quality. The record will include audits results, minutes from reviews and any other analysis or feedback with regard to the operation of the system. It is for management to assess these records and act on them accordingly.

Quality system element (ISO 9001):

  1. Management responsibility
  2. Quality system principles
  3. Auditing the quality system – internally
  4. Economic – Quality – related cost consideration
  5. Quality is marketing (Contract Review)
  6. Quality is specification and design (Design control)
  7. Quality is procurement (Purchasing)
  8. Quality is production (Process control)
  9. Control of production
  10. Material control & traceability (Product identification & traceability)
  11. Control of verification status (inspection & test status)
  12. Product verification (Inspection & Testing)
  13. Control of measuring and test equipment
  14. Nonconformity
  15. Corrective action
  16. Handling & post production functions
  17. After sales servicing
  18. Quality documentation & record (control of record)
  19. Personnel (Training)
  20. Product safety & liability
  21. Use of statistical methods
  22. Purchaser supplied product

Quality Plan (BS 4778 : Part 1)

: A document setting out the specific quality practices, resources and sequence of activities relevant to a particular product, services, contract or project.

A quality plan is a supplementary quality system document.

Quality manual and procedure (BS 4778 : Part 2)

: A document setting out the general policies, procedure and practices of an organization.

The following sequence may be used:

  1. Document the existing organizational structure and responsibilities of key personnel.
  2. Document the existing procedure from the receipt of order through to handover to the customer or beyond if necessary
  3. Analyze the existing system, compare with the requirement and document any proposed amendments.
  4. Decide on the number of quality document tiers necessary to achieve objectives.
  5. Propose your structure and any change to existing practices to the organization – management.
  6. When structure and change are agreed, produce draft quality document.
  7. Produce final quality documents when final draft are agreed.

Quality auditing

A quality audit is a systematic and independent examination to determine whether quality activities and related result comply with planned arrangement and whether these arrangement are implemented effectively and are suitable to achieve objectives.

Audit may be carried out by:

  1. A company on its own system – know as an internal or first party audits.
  2. An organization on a supplier or potential supplier – known as external or second party audits.
  3. Accreditation authorities on a organization who is accredited, or wishes to be accredited, to the authorities quality standard – known as extrinsic or third party audits.     

The purpose of an audit on a quality system is to obtain objective evidence of the practices and results of quality related activities, to then compare these findings against the documented planned arrangements, in order to provide an assurance that those planned arrangements are complied with.

An audit is typically conducted in five phases:

  1. Opening the meeting
  2. The audit
  3. Evaluation of audit findings.
  4. The closing meeting
  5. The submission of an audit report including any corrective action request on non conformity found.

QA Standard:

BS 4778                      : Quality vocabulary (international terms, quality concepts and

  related definition)

BS EN ISO 9000-1     : Quality management & Quality assurance standard

                                      Part 1  for guidelines for selection & use

BS EN ISO 9000-2     : Quality management & Quality assurance standard

                                      Part 2 for Generic guidelines for the application of ISO 9001,

                                      ISO 9002 and ISO 9003.

BS EN ISO 9001         : Quality systems – model for quality assurance in design,

  development, production, installation & servicing.

BS EN ISO 9002         : Quality system – Model for quality systems in production,

  installation and servicing.

ISO 9004-1                 : Quality management and quality standards

                                      Part 1 for guidelines

ISO 9004-2                 : Quality management and quality standards

                                      Part 2 for guidelines for services

ISO 10005                   : Quality management – guidelines for quality plans

BS EN 30011              : Guide for auditing quality systems.


8 Responses

  1. iam mechanical engineering iwork in construction of welded steel oil storage tank and its design

  2. Hi sir, this is logan, iam working as a quality controller. can you pls help me to send some different types of ITP for piping & structural works. I had gone through your statements regarding quality control, I find all the points are very very important to me and easy to understand also. even though iam in this field for long time still i wonder i need to learn many things regarding my profession after get into this site and statements only. Thanks for your wonder ful work.

    • Ok Logan,..nice to know you. Please..Send your email address to me and I will send some ITP for piping & structural works.

  3. Hello. I’m working on the QA/QC department of an instrumentation and electricity and as it suggest we dont make too much of welding…we only weld supports for cable trays,,,
    The problem is that the client is now requesting an ITP for that weld… What happens is that we only make, a need to make visual inspection…no other test…
    Any way, can somebody help me sending some ITP’s exemples for visual inspection on that kind of weld??

    Thanks a lot.

  4. Good Morning

    Please can you provide me with information on the layout or index for vendor documentation. We are currently busy completing the final Data Dossiers for a Tanks Farm in Angola.

    If you have a copy of a complete index for a tank farm

  5. Lukman,
    We are a major tank repair client, I went through your web that is really informative to share. Would you please provide a sample ITP and a Quality Dossier for tank repair/construction with an extensive repairs including foundation, floor, shell, roof cone/float/dome ,etc.


  6. I read your post . it was amazing.Your thought process is wonderful.The way you tell about things is awesome. They are inspiring and helpful.Thanks for sharing your information and stories.

    iso 9000

  7. hi,,
    I am Mitesh and working in Quality controll Department,,can u send me some ITP and QCP for piping and statutory equipment. my email Id



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