Lecture Chapter 5: Modeling systems requirements - Events and things

Lecture 'Chapter 5: Modeling systems requirements - Events and things' provides students with the knowledge: Models and modeling, types of models, overview of models used in analysis and design, types of models, overview of models used in analysis and design,... Invite you to consult.

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Lecture Chapter 5: Modeling systems requirements - Events and things 5 5 Learning Objectives Chapter 5:  Explain the many reasons for creating information system models Modeling Systems Requirements: Events and Things  Describe three types of models and list some specific models used for analysis and design  Explain how events can be used to define system Systems Analysis and Design in a Changing requirements World, 3rd Edition  Identify and analyze events to which a system responds  Recognize that events trigger system activities or use cases Systems Analysis and Design in a Changing World, 3rd Edition 2 5 5 Learning Objectives (continued) Overview  Explain how the concept of things in the system  Document functional requirements by creating also defines requirements models  Explain the similarities and the differences  Models created during analysis phase activity: between data entities and objects Define system requirements  Identify and analyze data entities and objects  Two concepts define system requirements in needed in the system traditional approach and object-oriented  Read, interpret, and create an entity-relationship approach diagram  Events  Read, interpret, and create a class diagram  Things Systems Analysis and Design in a Changing World, 3rd Edition 3 Systems Analysis and Design in a Changing World, 3rd Edition 4 5 5 Models and Modeling Reasons for Modeling  Analyst describes information system requirements using a collection of models  Complex systems require more than one type of model  Models represent some aspect of the system being built  Process of creating model helps analyst clarify and refine design  Models assist communication with system users Systems Analysis and Design in a Changing World, 3rd Edition 5 Systems Analysis and Design in a Changing World, 3rd Edition 6 5 5 Overview of Models Used Types of Models in Analysis and Design  Different types of models are used in information  Analysis phase activity named “define system systems development requirements”  Mathematical - formulas that describe technical  Logical models aspects of the system  Provide detail without regard to specific technology  Descriptive - narrative memos, reports, or lists that  Design phase describe aspects of the system  Physical models  Graphical - diagrams and schematic  Provide technical details representations of some aspect of the system  Extend logical models Systems Analysis and Design in a Changing World, 3rd Edition 7 Systems Analysis and Design in a Changing World, 3rd Edition 8 5 5 Models Used in Analysis Models Used in Design Systems Analysis and Design in a ...