Which type of requirements are temporary in nature?

The requirements elicitation technique used to iteratively validate the needs of stakeholders that interact with the application is:

What happens when either the number of requirements or level of formality increase?

The process of assigning requirements to solution components and releases to best achieve the objectives is called:

Which activity is a business analyst (BA) performing when ensuring that a set of requirements is developed
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with enough detail to be usable by a particular stakeholder?