One thing that user stories help the business analyst do is encourage iterative development. Iterative development is an approach that breaks down a project into smaller cycles or iterations, each delivering a working piece of functionality or value to the user. User stories are well suited for iterative development because they are concise, focused, and prioritized based on user needs and value. User stories help to deliver features faster and more frequently, while allowing for feedback and changes along the way. References:
https://trailhead.salesforce.com/content/learn/modules/user-story-creation/learn-about-user-stories

these are the characteristics that make a user story successful, according to the INVEST acronym. A user story should be independent of other user stories, negotiable in terms of scope and details, valuable to the user or customer, estimable in terms of effort and time, small enough to fit in a sprint or iteration, and testable with clear acceptance criteria. References: https://trailhead.salesforce.com/content/learn/modules/user-story- creation/learn-about-user-stories

Explanation
The groups that the business analyst should work with to gain full alignment on a common program vision and strategy are senior leadership, IT leadership, and middle management. Senior leadership are the executives who have the authority and vision for the Salesforce implementation. IT leadership are the managers or directors who oversee the technical aspectsof the Salesforce implementation. Middle management are the supervisors or team leads who manage the sales and service teams. These groups can help the business analyst define the goals, scope, requirements, and success criteria of the Salesforce implementation, and resolve any disagreements or conflicts among them. Business leaders, end users, and executive sponsors are other groups that may be involved in the Salesforce implementation, but they may not have the same level of influence or responsibility as senior leadership, IT leadership, and middle management. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/collaboratio