T$1.$ Define a possible scope for the following systems. First, list a wide range of things that the

system could do$.$ Then narrow down the scope. To do this, select a minimal set of the most

important features that you would implement in the first release of the system.

$($a$)$ A police information system.

$($b$)$ A system for real$-$estate agency.

$($c$)$ A system for a public library.

$($d$)$ A system for a car$-$rental agency.

T$2.$ Apply the Abstraction$-$Occurrence pattern in the following situations. For each situation,

show the two linked classes, the association between the classes, and the attributes in each class.

$($a$)$ The issues of a periodical.

$($b$)$ Models of electronic appliances and the individual appliances.