Quality control is a procedure of set of procedure intended to ensure that a manufactured product an performed service adhere to defined a set Quality criteria or meets the requirements of the client or customer.

The ISO definition starts that quality control is the operational techniques and activities that are used to fulfill requirements for quality.Quality control is the process for maintaining standards and not for creating them standards are maintained through a process of selection from the process meet the standards.

In simple terms quality control prevents undesirable changes being present in the quality of the product or service being supplied.

Quality control is the construction industry can be looked at as having three elements:

i. To produce a building / product this satisfies the client

ii. To produce a building / product where quality is related to the price.

iii. To produce a building / product in which sufficient time is allowed to obtain the desired quality.

iv. Repeatable Process - Quality management systems will provide business with a number of process that are constantly repeated to produce a product or a service.

v. Knowledgeable Staff- Because of many repeatable processes,the staff carrying. Out of these actions will have a clear definition of their roles and responsibilities.In knowing the exact process that needs to be carried out,mistakes and errors will decrease.

vi. Increased Business- Many clients actively seek an organization that has some sort of quality management accreditation,whether it is from ISO or from another body.

vii. Supplier Relationships: A good quality control will define a procedure where by all new and existing supplier are vetted on a regular basis to ensure their competence and quality of service.