Temporal scenarios consist of multiple milestones that correspond to different moments in a hypothetical user's interaction with a health technology. For each milestone, you can write multiple sub-scenarios in order to explore different possibilities. For example, depending on their prior experience with technology, the user may have no problem using your product, or they might face some challenges. To get more familiar with the concept of temporal scenarios and personas, you can take a look at the starter pack.
Before you start creating your scenario, you need to have a persona. They will be the virtual user of your technology.