UI design is not so much about how an interactive looks but rather focuses on implementing the correct tools in order for the user to successfully accomplish their goals. Because the fundamental principles are so simple, it is easy to forget the basics and stray away from UI design. A strong UI should reflect a balance of good aesthetics and an effortless interactivity which guides the user through their experience.
As mentioned before, each stage that is included in the process of developing an interactive product relates to one another. A user scenario is highly dependent on a user persona to be able to reach its full potential. Where a user persona develops a hypothetical user, a user scenario depicts a proposed situation based on the persona and how they would interact with the product in order to reach a given goal.
The fundamental topics that should be addressed include:
WHO – WHAT – WHERE – WHEN – WHY – HOW
This helps the designer follow a visual navigational path and discover what elements are missing and which don’t work. Therefore, it is important to develop a thorough user scenario in order to create a successful interactive product.
Below is a great website which goes through step-by-step how to develop a strong scenario.