The overall risk score, commonly referred to as the "Risk Exposure," is determined by multiplying a risk's likelihood (or probability) with its impact. This provides a quantitative measure that aids in understanding the potential severity of the risk, allowing for more informed decision-making.

Usability Testing is a technique used to evaluate a product by testing it on users. In this phase, real users interact with prototypes of the design to uncover potential usability flaws. This helps ensure that the end product is user-friendly and offers a good user experience before finalizing the design.

Beta Testing is a phase where the software is exposed to the real-world potential users before the final release. It's a type of User Acceptance Testing (UAT) where actual users use the software and provide direct feedback. This feedback can be related to functionality, usability, performance, or any other aspect of the software.

Usability Testing not only evaluates the ease of use of a product but also examines its overall user interface, ensuring there's consistency in design, clear error messaging, and providing meaningful feedback. This ensures a seamless, user-friendly experience for the end-user.

Exit criteria in the Software Testing Life Cycle (STLC) are a pre-defined set of conditions or metrics which must be achieved to conclude a testing phase. These conditions could include factors like achieving a certain percentage of test coverage, a limited number of high-severity defects remaining open, meeting performance benchmarks, etc. Having a clear exit criteria ensures that a testing phase achieves its intended quality objectives before moving to the next phase.

Decision Coverage in white-box testing ensures that each decision point or branch has been executed for both 'true' and 'false' conditions. It is more robust than simple statement coverage because it ensures that each decision leads the control flow in both directions.

Automated test suites, which consist of a collection of test scripts, test data, and execution sequences, require effective management to ensure organized execution and reporting. Test Management tools offer capabilities to define, organize, and execute tests, as well as to report defects and generate metrics, streamlining the automation workflow.

The Test Manager oversees the entire testing process and ensures that all testing activities align with the project timelines and budget. They coordinate between stakeholders and the testing team, ensuring that the testing phase progresses smoothly.

Git is a widely-used Configuration Management tool. It helps developers track and control changes in the software, allowing multiple developers to collaborate on a project simultaneously without interfering with each other's changes, and helps maintain version history.

The choice of tools for automated testing often depends on the software's architecture. Different architectures might require specialized tools or have certain constraints that make one tool more suited over another. For instance, a web application and a mobile application would have different automation tool requirements.