Sample $9$

On cellphone and email over a day or two, Priya and a group of

her friends agree to take in some entertainment together on the

coming weekend. They agree to meet at the Ticket Kiosk

System kiosk at the library bus stop at $5$:$30$ PM on Friday.

Some walk to the kiosk from nearby, while others avail

themselves of the convenience of the bus. The group is in a

festive mood, looking forward to sharing some fun over the

weekend.

scenario analysis

artifact Model

physical modelQuestion $2$

Sample $12$

barrier listing

trigger use listing

goal use listing

user use listing