Introduction to Sad

Topics: Software development process, Systems engineering, Business process modeling Pages: 11 (1136 words) Published: March 28, 2012
Introduction to SAD

LIS 163 Sir Igor


Companies use information as a weapon in the battle to increase productivity, deliver quality products and services, maintain customer loyalty, and make sound decisions. Information technology can mean the difference between success and failure

The Impact of Information Technology
Information Technology

Combination of hardware and software products and services that companies use to manage, access, communicate, and share information A vital asset that must be used effectively, updated constantly, and safeguarded carefully

The Impact of Information Technology

The Role of SAD

Systems Analysis and Design Systems Analyst
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Step-by-step process for developing high-quality information systems Plan, develop, and maintain information systems Combines information technology, people and data to support business requirements

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Information System

The Impact of Information Technology

Who develops Information Systems?
– – – – – – –

In-house applications Software packages Internet-based application services Outsourcing Custom solutions Enterprise-wide software strategies How versus What

The Impact of Information Technology

Information System Components
A system is a set of related components that produces specific results – A Mission-critical system is one that is vital to a company’s operations – Information systems have five key components: hardware, software, data, processes, and people –

The Impact of Information Technology

Information System Components
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Moore’s Law

Is the physical layer of the information system

The Impact of Information Technology

Information System Components

● ● ● ● ●

System software Network operating system Application software Enterprise applications Horizontal system –


Vertical system

A basic system, such as an inventory or payroll package that is commonly used by a variety of companies. A system designed to meet the unique requirements of a specific business or industry, such as a Web-based retailer or video rental chain.

The Impact of Information Technology

Information System Components



Is the raw material that an information system transforms into useful information Define the tasks and business functions that users, managers, and IT staff members perform to achieve specific results Users, or end users, are the people who interact with an information system, both inside and outside the company


Understanding the Business

Systems analysts use a process called business process modeling to represent a company's operations and information needs. Business Profile –

A business profile defines a company's overall functions, processes, organization, products, services, customers, suppliers, competitors, constraints, and future direction.

Understanding the Business

Business Model

A business model graphically represents business functions that consist of business processes, such as sales, accounting, and purchasing.

Understanding the Business

Business Process

A business process describes specific events, tasks, and desired results. An attempt by companies to simplify operations or reduce costs.

Business Process Reengineering

Understanding the Business

Product-oriented vs Service-oriented Internet-dependent vs Brick and Mortar

Impact of the Internet

E-commerce / I-commerce

Business-to-Business (B2B)

A commercial exchange (e.g. products or services) between businesses, typically enabled by the internet or electronic means. A commercial exchange (e.g. products or services) between businesses and consumers conducted over the internet.

Business-to-Consumer (B2C)

Web-based Systems Development

How Business Uses...
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