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Mark Pearl

Any ramblings and blog posts associated with the UNISA ICT 2621 tag should be considered study notes for my lectures…

Objectives of Chapter 9

  • Discuss the issues related to managing and coordinating the activities of the SDLC
  • Explain the major components and levels of design
  • Describe each major design activity
  • Develop a simple network diagram
  • Describe common deployment environments and matching application architectures

Key Words & Definitions

  • architectural design – broad design of the overall system structure; also called general design or conceptual design
  • detail design – low level design that includes the design of specific program details
  • interface designers – specialists in user interface design; also called usability consultants or human factors engineers
  • computer network – a set of transmission lines, equipment, and communication protocols to permit sharing of information and resources
  • local area network – a computer network in which the distances are local, such as within the same building
  • wide area network – a computer network spread across large distances, such as a city, state or nation
  • router – network equipment that directs information within the network
  • Internet – a global collection of networks that use the same networking protocol – TCP/IP
  • World Wide Web - a collection of resources such as files and programs that can be accessed over the internet using standard protocols
  • intranet – a private network that is accessible to a limited number of users, but which uses the same TCP/IP protocol as the internet
  • extranet – an intranet that has been extended outside the organization to facilitate the flow of information
  • virtual organization – a loosely coupled group of people and resources that work together as though they were an organization
  • virtual private network – a network with security and controlled access for a private group but built on top of a public network such as the internet
  • network diagram – a model that shows how application layers are distributed across locations and computer systems
  • single-computer architecture – architecture that employs a single computer system executing all application-related software
  • multitier architecture – architecture that distributes application-related software or processing load across multiple computer systems
  • clustered architecture – a group of computers of the same type that share processing load and act as a single large computer system
  • multicomputer architecture – a group of dissimilar computers that share processing load through specialization of function
  • centralized architecture – architecture that locates all computing resources in a central location
  • distributed architecture – architecture that deploys computing resources in multiple locations connected by a computer network
  • server – a process, module, object, or computer that provides services over a network
  • client – a process, module, object, or computer that requests services from one or more servers
  • three-layer architecture – a client/server architecture that divides an application into the view layer, business layer, and data layer
  • data layer – the part of three layer architecture tat interacts with the database
  • business logic layer – the part of three-layer architecture that contains the programs that implement the business rules of the application
  • view layer – the part of three-layer architecture that contains the user interface
  • web services architecture – a client/server architecture that packages software into server processes that can be accessed via Web protocols
  • middleware – computer software that implements communication protocols on the network and helps different systems communicate

Example Questions on this Section

  • What are the key questions that must be decided and implemented with regard to assigning tasks to team members?
  • The term centralised architecture describes deployment of all computer systems in a single location. Centralised architecture is generally used for large-scale processing applications, including both batch and real-time applications. Give the characteristics of Information Systems in these industries.
  • List the seven steps in developing a structure chart

Project Management Revisited: Execution and Control of Projects

 

Understanding the Elements of Design

 

Design Activities

 

Network Design

 

The Deployment Environment and Application Architecture

Posted on Tuesday, September 21, 2010 7:53 AM UNISA ICT 2621 Structured Analysis & Design | Back to top


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