What is system testing?

System Testing

System testing is testing conducted on a complete, integrated system to evaluate the system's compliance with its specified requirements.

It includes following

• Functional/ Regression Testing
• Usability Testing
• Compatibility Testing
• Performance Testing
• Security Testing etc

It is done by testers

What is adhoc testing?

Ad hoc Testing

Error guessing is an ad hoc approach, based on experience, to identify tests that are considered likely to expose errors.

Most ad hoc testers focus on the things that have failed in the past or things that they know are important or situations that are always problematic