QUESTION 1 Consider the following scenario for an Online Bus Reservation System application: Consider an online reservation system for a bus company, The bus company includes several buses and realizes trips to different cities. Such bus is identified by its plate color and a separately assigned bus number. The trips are based on a predefined schedule and stop at predefined bus stations. Each bus can have only one trip per day, each bus includes a driver and one hostess. For long trips, the bus will have a break at, service and rest areas, there are two types of trips: normal trips and express trips. Express trips do not stop at intermediate stations and get faster at the destination, Seats can be reserved by customer on the web site of the bus company The customer has the option to directly pay for the seat through the website. In that case, the seat cannot be cancelled (neither by the customer nor by the company). If the customer has not paid for the seat, the bus company can cancel the seat if the customer does not show up one hour before the trip. When the reservation is cancelled, the seat will become free and can be sold to another customer. Both the customer and the company staff must authenticate themselves for performing operations with the system a) Draw the USE CASE Diagram (having at least one "include" and "extend" connection). Mention the purposes of include or extend symbol. b) Write down the USE CASE Descriptive Form for one of a major Use Case. c) Draw Sequence Diagram for the above scenario.

In the following description, explain when the term account is used as an application domain concept and when as a solution domain concept: "Assume you are developing an online system for managing bank accounts for mobile customers. A major design issue is how to provide access to the accounts when the customer cannot establish an online connection. One proposal is that accounts are made available on the mobile computer, even if the server is not up. In this case, the accounts show the amounts from the last connected session."

9. The following information is required in the ward computer management system of a hospital: Department: Department name, department address, department telephone Ward: ward number, bed number, department name Doctor: name, title, department name, age, work permit number Patient: medical record number, name, gender, diagnosis, attending doctor, ward number Among them, a department has multiple wards and multiple doctors; A ward can only belong to one department; A doctor only belongs to department, but can be responsible for the diagnosis and treatment of multiple patients. There is only one doctor in charge of a patient. (1) Draw the ER diagram according to the above semantics, and indicate the attribute of the entity, the type of connection and the identifier of the entity in the ER diagram. (2) The ER model is transformed into a relational model, and the primary key and foreign key of each relational schema are pointed out. one

The requirements below partially describe a game management system (such as Steam) that is used for managing game installations of a player. Draw a UML class diagram describing an object-oriented system using the list of requirements below. Each user can own many games. Games have many copies in the system. Games have many achievements and collectibles. Each achievement can be accomplished by many players. There are two types of items in the system: seasonal item and collectible item. Users can obtain many items. There are three types of user interactions: post, reply and (game) review. Users can create many posts. Users can reply to a post. Posts can receive many replies. Reviews are written by users for a game. A user can write many reviews. A game can have many reviews. RQ1: Users own game copies not the actual games. RQ1: All user objects are managed by a user manager object in the system (design decision). RQ5&RQ6: Users own collectible items not actual collectibles. Each…