Component Testing

Lowest level of testing, detail, finding faults, performed by the developers

Component Integration

Combining components, testing interfaces, performed by developers, various types of integration (top-down, functional, bottom up and big bang). Business scenarios and non-functional aspects if possible.

System Testing (functional and non-function)

Testing the system as a whole. Testing requirements and business processes. Also testing non-functional aspects such as Performance, usability etc.

System Integration

Testing the system with other systems and networks

Acceptance Testing Testing by users/customers to gain confidence that the system is going to support the business as well as meet their requirements.