System Analysis and Design

System analysis and design (sad) – is a step by step process for developing high quality info. Systems.

In-house applications – info. Systems owned by a company or is being developed for a company

Software packages – otherwise known as purchased systems or info. Systems bought from vendors.

System – set of related components that produces specific results.

* Mission-critical system – systems that are vital to a company’s operation

Ex. Order processing system, enrollment system

* Data – consists of basic facts that are the system’s raw material.

* Information- is the data that has been transformed into output that is valuable to users

5 key components of info. System:

* Hardware-consists of everything in the physical layer of an IS

Ex. Servers, workstations, networks, telecommunication equipment, fiber-optic cables, handheld computers, scanners, digital capture devices

* Software – refers to the programs that control the hardware and produces the desired info. Or results.

- sytem software – manages the hardware components which can include a single

workstation or a global network with many thousands of clients.

Ex. Operating systems, device drivers, security software

-application software – consists of programs that support day-to-day business

functions and provide users with the info. They require

Ex. Work processor, electronic spreadsheet, database

management systems (DBMS), computer-aided design,

animation and presentation, desktop publishing,...