ch.6 (2).pptx

Foundations for Systems Design Chapter 6 Systems Analysis and Design in a Changing World 7th Ed Satzinger, Jackson & Burd Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Learning Objectives Describe systems design and contrast it with...

Foundations for Systems Design Chapter 6 Systems Analysis and Design in a Changing World 7th Ed Satzinger, Jackson & Burd Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Learning Objectives Describe systems design and contrast it with systems analysis List the documents and models used as inputs to or output from systems design Explain each major design activity Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Overview Analysis says “what” is required and design tells us “how” the system will be configured and constructed Chapters 2, 3, 4, 5, and Online B covered systems analysis activities (requirements) This chapter introduces system design and the design activities involved in systems development Design bridges the gap between requirements to actual implementation Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design Activities and Iterations Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. What is Systems Design Analysis provides the starting point for design Design provides the starting point for implementation Analysis and design results are documented to coordinate the work Objective of design is to define, organize, and structure the components of the final solution to serve as a blue print for construction Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Analysis to Design to Implementation Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Analysis Models to Design Models Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design Activities Design activities correspond to components of the new system The environment Application components User interface Database Software classes and methods Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design Activities and Iterations Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Key Design Questions for each Activity Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Describe the Environment Two key elements in the environment Communications with External Systems Message formats Web and networks Communication protocols Security methods Error detection and recovery Conforming to an existing Technology Architecture Discover and describe existing architecture Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design the Application Components Application component is a well defined unit of software that performs some function(s) Issues involve how to package components including Scope and size – what are the functions, boundaries, interfaces? Programming language – what are the accepted languages? Build or buy – is an acceptable version available to purchase? Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Typical models for defining application component s Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design the User Interface To the user, the User Interface is the system. The user interface has large impact of user productivity Includes both Analysis and Design tasks Requires heavy user involvement Current needs require multiple user interfaces Many different devices and environments Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Typical models for user interfac e design Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Design the Database By definition, an Information System requires data – usually in a database Current technology frequently use Relational Database Management Systems (RDBMS) Requires converting the data model to a relational database Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Typical Design Class Diagram with attributes and methods Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Summary This chapter introduces the concept of Systems Design Analysis is fact finding and modeling Design is modeling to specify how system will be implemented Design is bridge between analysis an implementation Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved. Summary (continued) Activities of Systems Design Describe the environment Design the application components Design the User Interface Design the database Design the software classes and methods Systems Analysis and Design in a Changing World, 7th Ed - Chapter 6 ©2016. Cengage Learning. All rights reserved.