This should be done early on in solution outlining (you might do it hypothetically at first, and then get feedback on how it looks in reality). It’s also a good tool to come back to as you explore additional pieces of your solution.

By visualizing the user journey a team can better understand the various points of interaction and potential opportunities for good or bad experiences.

Post its, sharpies, and wall space or a whiteboard. Alternatively, you can use online tools like Mural or Miro