Defect – Definition and Causes

What is a Defect?

  • A flaw or weakness in a system that causes the system to fail
  • Non-conformance to a standard
  • A disorder in the system or process which can cause a failure or discrepancy in the delivery of product or services.
  • Expectations are not meet.
A defect can be seen as an opportunity for improvement.

What causes a defect?

  • Incorrect information
  • Lack of skill/knowledge
  • lack of training
  • Proper monitory
  • Poor planning
  • Poor Execution
Defects caused by tighter internal tolerances

If your internal tolerance range for a dimension is more strict than that required /given by the customer, it might happen that you have a product which is not defective from the customer’s point of view, even though internally it would be considered as defective.

Designing the right tolerances is an important aspect of the product or service design.