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
