CIS 634 Object-Oriented Software Engineering Chapter 4 Exercise Answers 70% Requirements Engineering Name: Ganesh Darapaneni Csu id:- 2749362 Name: Bharadwaj Chava Csu id: 2741566 Identify and briefly describe four types of requirement that may be defined for a computer based system. ANS. Types of requirements for a computer based system: Generally, system requirements are intended to communicate the functions that the system should provide. And every computer based systems consists of many requirements. They are 1. User requirements 2. System requirements 3. Functional requirements 4. Non-functional requirements Description for requirements: User requirements: These requirements are the statements in a natural language plus diagrams of the services the system provides and its operational constraints. System requirements: A structured document setting out detailed descriptions of the system’s functions, services and operational constraints. Defines what should be implemented. It may be part of a contract between client and contractor. Functional requirements: These are the statements of services that the system should provide, how the system should react to particular inputs and how the system should behave in particular situations. Non-functional requirements: Constraints on the services or functions offered by the system such as timing constraints, constraints on the development process, standards, etc. Often, these are applied to the system as a whole rather than individual features or services. 1. Discover ambiguities or omissions in the following statement of the requirements for part of a ticket-issuing system: An automated ticket machine sells rail tickets. Users select their destination and input a credit card and a personal identification number. The rail ticket is issued and their credit card account charged. When the user presses the start button, a menu display of potential destinations is activated, along with a message to the user to select a destination and the type of ticket required. Once a destination has been selected, the ticket price is displayed and customers are asked to input their credit card. Its validity