Q3. Happy Hour Message
Draw a sequence diagram for the HappyHourMessage scenario in the figure 1 below. Draw only
the first five messages exchanged.
Scenario name HappyHourMessage
bob, alice: BarFlies
Flow of events 1. Bob and Alice are sitting in their favorite pub and
it’s happy hour.
They want to invite their common friend John
who likes cocktails and didn’t know about the
newly scheduled happy hour. Alice takes out her
“mobile phone” and activates the “SMS”
2. Alice enters John’s cell phone number and
writes the message about the happy hour into
the “SMS text field”. She sends the message
and waits for John’s answer.
3. John, who is still at work, is alerted by a sound
of his cell phone that a new “SMS” has arrived.
He reads the lines from Alice and answers that
he will come immediately. He quits working and
leaves the office.
4. Alice receives John’s answer at her “mobile
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