The "risk matrix" is a tool that visualizes risks in a matrix format, based on their likelihood (or probability) on one axis and their impact on another. By categorizing risks in this manner, teams can easily prioritize which risks need immediate attention and which can be addressed later or monitored.

Configuration Management ensures consistency across various attributes of a product. One of these attributes is the 'physical' aspect, which relates to the tangible characteristics, components, and structure of the product. This is vital for ensuring the product meets the expected standards and requirements.

Big Bang Integration Testing involves integrating all the modules or components at once after they are fully developed. This can sometimes lead to challenges in identifying defects as all components are integrated in one go without any incremental checks.

The "Enough Time" guideline under accessibility testing ensures that users, especially those with disabilities, are given adequate time to read, comprehend, and utilize the content. This is crucial to make the web inclusive for all users.

End-to-End Testing involves testing an application's flow as a whole to ensure that the entire process of a user accessing and using the site works smoothly. In this scenario, the entire shopping process, from product selection to payment and receiving a confirmation, is being tested, making it a classic case of End-to-End Testing.

Equivalence Partitioning is a test design technique where input data is divided into different equivalence classes based on their behavior. Testing only one value from each class is deemed sufficient. For a vast range of input numbers, it reduces the number of tests while ensuring effective coverage.

Component Testing: Also known as module or unit testing, this focuses on testing specific functions or modules of an application independently to ensure their performance. It aims to identify any issues at the component level before integrating them into the larger system.

The "Retesting" phase in the bug life cycle is when a specific defect or bug has been fixed and is tested to ensure its rectification. It's a verification process to confirm that the particular defect has been successfully addressed.

Incremental Integration testing involves testing parts of a system sequentially as they're developed. In environments where multiple teams work on different components, this approach ensures that each new piece integrates smoothly with the existing parts, helping detect issues early and reducing integration risks.

A Walkthrough is a type of review where the author leads members of the review through the document based on their understanding. It's informal in nature and often relies on scenarios to provide the reviewers with a deeper understanding. The main goal is to gather feedback and achieve a common understanding.