10.2.2. Requirement Analysis

• Core functionalities

Core functionalities refer to the essential tasks that the program must be able to perform. This is the backbone of the software application, determining what users should be able to do with the Employee Management System. For instance, in our EMS application, the core functionalities include adding new employee records, updating existing records, and deleting records as needed.

Consider a restaurant management system where core functionalities would include managing menu items, processing orders, and handling payments. Just as these functionalities are essential for the restaurant to operate, the core functionalities are crucial for the EMS to fulfill its purpose.

• Input/output specifications

Input/output specifications describe the expected inputs that the program will need to function, as well as how the program will present outputs to the user. In the case of the Employee Management System, inputs might include employee details such as name, department, and salary, while outputs could include confirmation messages upon successful operations and reports generated from employee data.

Think of input/output specifications like a vending machine. You input your selection and money (inputs), and the machine responds by dispensing a drink (output). Similarly, our EMS needs to know what information to expect from users and what it should provide in response.

• Security and exception handling

Security in software involves safeguarding sensitive data and ensuring that the application is resistant to unauthorized access. Exception handling refers to the process of responding to runtime errors or unexpected conditions during the execution of the program. In the EMS, security might involve confirming user identity before allowing access to employee records, while exception handling could involve notifying users if they attempt to delete a non-existing record.

Imagine the difference between a bank vault and a regular storage room. The vault has extensive security (like cameras and locks) to protect valuable items (security aspects), and if someone tries to access it without authorization, alarms go off (exception handling). The EMS needs similar protections and responses.

• UI (console/GUI/web)

The user interface is how users interact with the system. It can be a console (text-based), a graphical user interface (GUI) with buttons and windows, or even a web application. Each type of UI offers a different user experience and accessibility level. The EMS may use a console for simple inputs or a GUI for a more user-friendly approach, especially when generating reports.

Think of a restaurant menu as a user interface. A handwritten list (console) is simple but may not be user-friendly compared to a colorful digital menu (GUI) displayed on a tablet. Just as diners prefer clear menus that they can easily navigate, users of the EMS will benefit from a straightforward UI.

• Performance constraints

Performance constraints are limitations that the system must operate within, such as response time, memory usage, or scalability under load. In the EMS, performance constraints may include having the system respond quickly to user inputs even when handling large amounts of employee data, ensuring that the application performs efficiently during peak usage times.

Consider a highway during rush hour. If too many cars (requests) are on the road, traffic slows down (performance issues). Similarly, the EMS must be built to handle many concurrent users without slowing down, just like a well-designed highway can accommodate heavy traffic.

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