in Harmony ESW process you added User Stories as an additional starting point to the Microcycle. I think User Stories are usually used to describe the "problem" or "expectation" of a stakeholder regarding the "product". It is maybe something like a high level requirements elicitation approach, which differs from Use Cases.
What are your experiences and best practices to work with User Stories (e.g. high level approach) and Use Cases (e.g. detailed approach) regarding high-fidelity modelling and requirements refinement?
Do you have a taxonomy regarding requirements, use cases, user stories and modelling?