OWASP Software Assurance Maturity Model

Verification
Verification focuses on the processes and activities related to how an organization checks and tests artifacts produced throughout software development. This typically includes quality assurance work such as testing, but it can also include other review and evaluation activities.

Requirements-driven Testing
The goal of the Requirements-driven Testing (RT) practice is to ensure that the implemented security controls operate as expected and satisfy the project’s stated security requirements. It does so by incrementally building a set of security test and regression cases and executing them regularly.
A key aspect of this practice is its attention to both positive and negative testing. The former verifies that the application’s security controls satisfy stated security requirements and validates their correct functioning. These requirements are typically functional in nature. Negative testing addresses the quality of the implementation of the security controls and aims to detect unexpected design flaws and implementation bugs through misuse and abuse testing. In its more advanced forms, the practice promotes security stress testing, such as denial of service, and strives to continuously improve application security by consistently automating security unit tests and creating security regression tests for all bugs identified and fixed.
Although both the Requirements-driven Testing and Security Testing practices are concerned with security testing, the former focuses on verifying the correct implementation of security requirements, while the latter aims to uncover technical implementation weaknesses in an application, irrespective of requirements.