“Application testing services” is a comprehensive term for the verification and validation services that support quality control and quality assurance (QA) of clients’ applications. Verification assesses whether a product/application or service complies with regulations, requirements, specifications or enforced constraints. Validation typically involves engagement with external customers to confirm suitability and acceptance. Infrastructure testing services, mobile device testing and software testing tools created for the market by independent software vendors (ISVs) are not included in this definition.