This answer states that building tooltips and discoverable content in the new console layouts is how the BA should help the EMEA sales team learn the new features after completing the user acceptance testing phase of a major update to Sales Cloud. Tooltips are small pop-up windows that provide brief explanations or instructions for a feature or a functionality when a user hovers over or clicks on an element. Discoverable content is content that is hidden until a user interacts with a trigger, such as a button, a link, or an icon.
Building tooltips and discoverable content in the new console layouts can help the BA to provide contextual and on-demand guidance and information to the EMEA sales team, and help them learn the new features at their own pace and convenience. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use-stakeholder

This answer states that number of passed test cases divided by total number of test cases is how the success rate is calculated after completing user acceptance testing (UAT) for a Commerce Cloud implementation at CK. Test cases are scenarios or steps that verify or validate if a feature or a functionality meets the acceptance criteria or requirements. Passed test cases are test cases that meet or pass the acceptance criteria or requirements. Total number of test cases are all test cases that are executed or performed for UAT. Number of passed test cases divided by total number of test cases is how the success rate is calculated because it measures how many test cases meet or pass the acceptance criteria or requirements out of all test cases executed or performed for UAT. References: https://trailhead.salesforce.com/en/content/learn/modules
/salesforce-business-analyst-quick-look/use-user-stories-to-capture-requirements

Explanation
The best practice that the BA should follow is to schedule additional discovery sessions with the sales users to understand what will be impacted by the changes. Discovery sessions are meetings or workshops where the BA elicits, clarifies, and validates the needs, expectations, pain points, goals, and priorities of the stakeholders for a project. Discovery sessions help to gather more information and feedback from the stakeholders, understand their perspectives and preferences, identify the gaps and opportunities in their current process, and demonstrate the value and benefits of the proposed solution. By scheduling additional discovery sessions with the sales users, the BA can better understand their challenges and requirements, and document a comprehensive list of the components that will be affected by the updated flow. References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-discovery/plan-and-facilitate-discove

User Acceptance Testing (UAT) ensures the solution meets business requirements and is ready for deployment:
* Validation of Business Needs: UAT allows end users to test the solution against real-world scenarios, ensuring the product aligns with the business processes.
* BA's Role in Testing: Salesforce highlights the importance of the BA in facilitating and supporting UAT to identify any gaps before stakeholder demos.
* Smooth Transition: UAT provides an opportunity to refine the product and enhance user confidence in its functionality.