Check the wiki following the UM instruction (e.g. the user instead of they)

https://www.student.cs.uwaterloo.ca/~se463/Slides/users.man.pdf

• check to include a typical scenario for each use case, expressed in natural language in one of several possible formats
  • the format of Lihua Ou's WD-Pic User's Manual,
  • multicolumn format as in the Scenarios and Use Cases slides,
  • single column, multicolor format, with the steps of each actor or process being in a different color,
  • the format of Adobe Acrobat's online help pages,
• check to include all needed exceptional scenarios for each use case, especially to deal with assumptions that do not hold,
• check to include all needed alternative scenarios for each use case, and
• check to include a user-interface description that is associated with these scenarios. If applicable.