$2($a$)$ Given the following initial attempt at a sequence diagram for "Display Bookings" and a

domain model for a restaurant booking system, add more detail to the sequence diagram

and show how it leads to changes in the class diagram.

Also consider how "Record an Arrival" use case realisation might affect the class

diagram.

Briefly comment on your refinements at each stage and mak reference to class

cohesion.

$(15$ marks$)$

$($b$)$ Provide a USE model $($no SOIL required $)$ for the domain class diagram above in part

$($a$).$ Only show what's in the diagram. It should also include an OCL version of the

constraint shown.

$(10$ marks$)$