Software Requirements and Design Scenario:

Note: Please explain every question in very Detail.I am not getting uml class diagram and uml sequence diagram from your side.Please give me in steps how to draw them.$($for ex: draw a rectangle box and divide it in three parts something like that$)$

In a small town in the $$Utopian land$,$ there is a Townhall. The Townhall provides multiple services to the residents. They would like to automate some of the services including:

$1)$ management of the library,

$2)$ a small cafeteria $($online orders can be made through an app$)$

that they have inside the town hall, and

$3)$ the marriage register.

Each new user in the system will be given a username and a password.

The town hall consists of $10$ employees. The library consists of about $3000$ books.

For getting a book, users can self$-$scan a book. Upon returning the book, the librarian will scan the book to update the system.

For the cafeteria, a small inventory of current items will be managed, which will be visible to users on the app. Once someone buys an item $($either online or in$-$person$),$ the cashier will scan the item, which will help update the inventory records.

Note: Please state your assumptions while attempting the questions:

Question$1$:

Design and draw a UML class diagram for the Townhall system. Include the main classes and their relationships for modelling the system. Maximum $6$ classes. Only display the classes, associations and their multiplicities.

Question$2$:

Draw a UML sequence diagram for the online process of ordering a sandwich.

Question$3$:

A first step of system design is to clarify the requirements, and then break down the solution domain into subsystems. A subsystem is a collection of classes, associations, operations, events and constraints that are interrelated.

a$)$Identify a list of subsystems for the Townhall system. Keep your subsystem decomposition simple and abstract at this stage. Make a list describing a maximum of $5$ subsystems.

b$)$What is the coupling between your subsystems? Is the level of coupling and cohesion in your system high or low? Explain your answer.

Question $4$:

Select one of your chosen subsystems and identify $2$ contrasting designs for implementing that subsystem. Use design rationale to document the best design decision considering these $2$ options. Your answer should clearly identify: Issue, Proposals $($your two design ideas$),$ Criteria, Arguments and Resolution. Also mention any unresolved questions or assumptions you identify.

Note: Please give everything in Detail along with the text in explanation as how to draw uml class diagram and uml sequence diagram