1 Systems Analysis & Design System Development Environment : Participants and Context IS 431: Lecture 1 CSUN Information Systems dn58412/IS431/IS431_F15.htm

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Systems Analysis & Design

System Development Environment : Participants and ContextIS 431: Lecture 1

CSUN Information Systems

http://www.csun.edu/~dn58412/IS431/IS431_F15.htm

IS 431 : Lecture 1 2

System Development Environment: Participants and Context

Information system applications - WHAT

Information systems and their stakeholders - WHORole of systems analysts -WHEN-WHYKnowledge and skill set for system analysts - HOWIS Building BlocksContemporary business and technology trends in

information systems development


Information Systems Vs. Information Technology

Information System (IS): People, data, processes, and information technology that interact to collect, process, store, and provide as output the information needed to support and improve operational, tactical, and strategic activities of an organization (business).

Information Technology (IT): A combination of computer technology (hardware and software) with telecommunications technology (data, image, and voice networks)


From Facts to Knowledge

Data – raw facts about people, places, events, and things that are of importance in an organization.

Information – data that has been processed or reorganized into a more meaningful form for someone.

Knowledge – data and information that is further refined based on the facts, truths, beliefs, judgments, experiences, and expertise of the recipient.

Wisdom – when to apply a certain knowledge


Decision-Making in an Organization


Decision-Making Levels

of an Organization

Executive Level– Long-term decisions (Strategies)

– Unstructured decisions (Competitions)

Managerial Level– Decisions covering weeks and months (Tactics)

– Semi-structured decisions (Effectiveness)

Operational Level– Day-to-day decisions (Operations)

– Structured decisions (Efficiency)


STRATEGIC

OPERATIONAL

EXECUTIVE INFORMATION SYSTEMS

MANAGEMENT INFORMATION SYSTEMS

TRANSACTION PROCESSING SYSTEMS

ACCOUNT I NG

F I NANCE

HUMAN RES

PRODUCTION

SALES

OTHERS

TACTICAL

VALUE CHAIN

Information Systems in Organization


Information System in Context


Types of Information Systems

Transaction Processing Systems Management Information Systems Executive Information Systems Decision Support Systems Expert Systems Functional Area Information Systems (Accounting, HR,

Sales, Production …) Office Automation Systems (Personal Productivity

Software) Collaboration Systems (Groupware) Enterprise Systems


Front- and Back-Office Information Systems

Front-office information systems support business functions that extend out to the organization’s customers (or constituents).– Marketing– Sales– Customer management

Back-office information systems support internal business operations of an organization, aw well as reach out to suppliers (of materials, equipment, supplies, and services). – Human resources– Financial management– Manufacturing– Inventory control


A Federation of Information Systems


Information System Applications


Stakeholders of a System

Stakeholder: any person who has an interest in an existing or proposed information system. Stakeholders can be technical or nontechnical workers. They may also include both internal and external workers.

Information workers are those workers whose jobs involve the creation, collection, processing, distribution, and use of information.

Knowledge workers are a subset of information workers whose responsibilities are based on a specialized body of knowledge.


Perspectives on an Information System


System Owners

System owners – an information system’s sponsors and executives advocate, usually responsible for funding the project of developing, operating, and maintaining the information system. They define the SCOPE of a system: what business problem to be solved– They view the system in term of cost/benefit to solve

business problem


System users – use or are affected by an information system on a regular basis – capturing, validating, entering, responding to, storing, and exchanging data and information. They define the REQUIREMENTS of the system.– Internal users

Clerical and service workers Technical and professional staff Supervisors, middle managers, and executive managers Remote and mobile users (internal but disconnected)

– External users

System Users


System designers translate system users’ business requirements and constraints into technical solution: computer databases, inputs, outputs, networks, and software meeting the system users’ requirements. Their activities relate to the DESIGN of a system

System builders constructs information systems based on the design specifications from the system designers. Their activities relate to building the COMPONENTS of the system.

System Designers and System Builders


Systems Analysts

Systems analysts study the problems and needs of an organization to determine how people, data, processes, and information technology can best accomplish improvements for the business. They are FACILITATORS of the system development project.• A programmer/analyst (or analyst/programmer)

includes the responsibilities of both the computer programmer and the systems analyst.

• A business analyst focuses on only the nontechnical aspects of systems analysis and design.


The Systems Analyst as a Problem-Solver

What “problems” to solve: (Project Definition)

– True problem situations, either real or anticipated, that require

corrective action

– Opportunities to improve a situation despite the absence of complaints

– Directives to change a situation regardless of whether anyone has

complained about the current situation

Why: (Project Justification)

– Efficient: Do thing right (Operational)

– Effective: Do right thing (Tactical)

– Competitive: Do thing differently (Strategic)


Systems Analysts At Work


Systems Analysts At Work

In traditional businesses– Working in traditional information services organizations

(permanent project teams)– Working in contemporary information services

organizations (dynamic project teams)In outsourcing businesses

– Contracted to traditional businessesIn consulting businesses

– Contracted to traditional businessesIn application software businesses

– Building software products for traditional businesses


Systems Analyst as a Facilitator


Systems Analyst as a Facilitator


Skills Needed by the Systems Analyst

Working knowledge of information technology

Computer programming experience and expertise

General business knowledge

General problem-solving skills

Good interpersonal communication skills

Good interpersonal relations skills

Flexibility and adaptability

Character and ethics

Systems Analysis and Design Skills


Information Systems Architecture

Information systems architecture - a unifying framework into which various stakeholders with different perspectives can organize and view the fundamental building blocks of information systems.


Focuses for Information Systems

KNOWLEDGE (Data) — the raw material used to create useful information.

PROCESSES — the activities (including management) that carry out the mission of the business.

COMMUNICATION (Interfaces) — how the system interfaces with its users and other information systems.



KNOWLEDGE FocusSystem owners’ view

– Interested not in raw data but in information that adds new business knowledge and information that help managers make intelligent decisions.

– Data entities and business rules.

System users’ view– Something recorded on forms, stored in file cabinets,

recorded in books and binders, organized into spreadsheets, or stored in computer files and databases.

– Focus on the business issues as they pertain to the data.– Data requirement – a representation of users’ data in

terms of entities, attributes, relationships, and rules independent of data technology.


KNOWLEDGE Focus …System designers’ view

– Data structures, database schemas, fields, indexes, and constraints of particular database management system (DBMS).

System builders’ view– SQL– DBMS or other data technologies


PROCESS Focus

System owners’ view – concerned with high-level process called business

functions

– Business function – a group of related processes that support the business. Functions can be decomposed into other subfunctions and eventually into processes that do specific tasks. (e.g.Sales Function)

– A cross-functional information system – a system that supports relevant business processes from several business functions without regard to traditional organizational boundaries such as divisions, departments, centers, and offices. (e.g. Production Function)


PROCESS Focus …

System users’ view – concerned with work that must be performed to provide

the appropriate responses to business events. – Business processes – activities that respond to business

events.– Process requirements – a user’s expectation of the

processing requirements for a business process and its information systems.

– Policy – a set of rules that govern a business process.– Procedure – a step-by-step set of instructions and logic

for accomplishing a business process.– Work flow – the flow of transactions through business

processes to ensure appropriate checks and approvals are implemented.


System designers’ view– Concerned with which processes to automate and how to

automate them– Constrained by limitations of application development

technologies being used– Software specifications – the technical design of

business processes to be automated or supported by computer programs (off-shelf, in-house) to be written by system builders.

PROCESS Focus …


System builders’ view– Concerned with programming logic that implements

automated processes– Application program – a language-based, machine-

readable representation of what a software process is supposed to do, or how a software process is supposed to accomplish its task.

– Prototyping – a technique for quickly building a functioning, but incomplete model of the information system using rapid application development tools.

PROCESS Focus …


COMMUNICATION Focus

System owners’ view– Concerned with communications scope of an

information system. Who (which business units, employees, customers, and

partners) must interact with the system? Where are these business units, employees, customers, and

partners located? What other information systems will the system have to

interface with?

System users’ view– Concerned with the information system’s inputs and

outputs (Interface Requirements).


System designers’ view– Concerned with the technical design of both the user and the

system-to-system communication interfaces.– Interface specifications – technical designs that document how

system users are to interact with a system and how a system interacts with other systems.

– User dialogue – a specification of how the user moves from window to window or page to page, interacting with the application programs to perform useful work.

System builders’ view– Concerned with the construction, installation, testing and

implementation of user and system-to-system interface solutions.

– Middleware – utility software that allows application software and systems software that utilize differing technologies to interoperate.

COMMUNICATION Focus …


Network Technologies and the IS Building Blocks


System Development Process Overview

System initiation – the initial planning for a project to define initial business scope, goals, schedule, and budget.

System analysis – the study of a business problem domain to recommend improvements and specify the business requirements and priorities for the solution.

System design – the specification or construction of a technical, computer-based solution for the business requirements identified in a system analysis.

System implementation – the construction, installation, testing, and delivery of a system into production.


System Development as Problem Solving


Business Trends and Driving Forces in the Environment

Globalization of the Economy

Electronic Commerce and Business

Security and Privacy

Collaboration and Partnership

Knowledge Asset Management

Continuous Improvement and Total Quality Management

Business Process Redesign


Globalization of the Economy

Global Economy– New and expanded international markets

– New international competitors

Impact on information systems– Require support of multiple languages, currency exchange rates,

business cultures

– Require consolidation of international data

– Demand for players who can communicate, orally and in writing, with management and users that speak different languages


Electronic Commerce and Business

E-Commerce – the buying and selling of goods and services by using the Internet.

E-Business – the use of the Internet to conduct and support day-to-day business activities.

Types of e-commerce and e-business– Marketing of corporate image, products, and services– Business-to-consumer (B2C)– Business-to-business (B2B)

Impact on information systems– Most new information systems are being designed for an Internet (or

intranet) architecture– Since the only client-side software is a web browser, the choice of

client operating system is becoming less important


Security and Privacy

Security– How will the business continue in the event of a security

breach, terrorist attack, or disaster?– How can the business protect its digital assets from

outside threats?Privacy

– Consumer demands for privacy in e-commerce transactions

– Government requirementsImpact on information systems

– Need to incorporate stringent security and privacy controls


Collaboration and Partnership

Organizations seek to break down the walls that separate organizational departments and functions.

Organizations collaborate with outside business partners and even competitors.

Impact on Information Systems– System Requirements from external parties / business

partners


Knowledge Asset Management

Knowledge Asset Management– Recognize that data, information, and knowledge are

critical business resources

– How the organization manage and share knowledge for competitive advantage

– Strive to integrate the data and information that can create and preserve knowledge


Business Processes – Tasks that respond to business events (e.g., an order). Business processes are the work, procedures, and rules required to complete the business tasks, independent of any information technology used to automate or support them.

Total Quality Management (TQM) – a comprehensive approach to facilitating quality improvements and management within a business.Do right thing in the first place, don’t wait until at the end with QA/QC (retooling!!!)

Total Quality Management


Business Process Redesign

From Reengineering to Redesign Business Process Redesign (BPR): the study,

analysis, and redesign of fundamental business processes to reduce costs and/or improve value added to the business.

Continuous Process Improvement (CPI) – The continuous monitoring of business processes to effect small but measurable improvements in cost reduction and value added


Technology Drivers for Information Systems

Networks and the Internet

Mobile and Wireless Technologies

Object Technologies

Collaborative Technologies

Enterprise Applications


Networks include mainframe time-sharing systems, network servers, and a variety of desktop, laptop, and handheld client computers.

The most pervasive networking technologies are based on the Internet.– xHTML and XML

– Scripting languages

– Web-specific programming languages

– Intranets

– Extranets

– Portals

– Web services

Networks and the Internet


Mobile and Wireless Technologies

Some mobile and wireless technologies– PDAs

– Smart phones

– Bluetooth

– Wireless networking

Impact on information systems– Wireless connectivity must be assumed

– Limitations of mobile devices and screen sizes must be accommodated


Object Technologies

Object technology – a software technology that defines a system in terms of objects that consolidate data and behavior.

Object-oriented analysis and design – utilize object technologies to construct a system and its software in system development process.

Agile development – a system development strategy in which system developers are given the flexibility to select from a variety of tools and techniques to best accomplish the tasks at hand.


Collaborative Technologies

Collaborate technologies are those that enhance interpersonal communications and teamwork.– E-mail

– Instant messaging

– Groupware

– Work flow


Enterprise Applications


Enterprise Applications - ERP

Enterprise Resource Planning (ERP) – a software application that fully integrates information systems that span most or all of the basic, core business functions.

An ERP solution is built around a common database shared by common business functions.

Representative ERP vendors: Baan, J. D. Edwards, Oracle, PeopleSoft, SAP AG (the market leader).


Enterprise Applications - SCM

Supply Chain Management (SCM) – a software application that optimizes business processes from raw material procurement through finished product distribution by directly integrating the logistical information systems of organizations with those of their suppliers and distributors.

Representative SCM vendors: i2 Technologies, Manugistics, SAP, SCT.


Enterprise Applications - CRM

Customer Relationship Management (CRM) – a software application that provides customers with access to a business’s processes from initial inquiry through post-sale service and support.

Representative CRM vendors: BroadVision, Epiphany, Kana, Nortel/Clarity, Peoplesoft/Vanitive, Siebel (the market leader)


Enterprise Application Integration


Enterprise Applications - EAI

Enterprise Application Integration (EAI) – the process and technologies used to link applications to support the flow of data and information between those applications.

Middleware – software used to translate and route data between different applications.

Representative EAI vendors: BEA Systems, IBM (MQSeries), Mercator Software, TIBCO Software


Current Business &Technology Drivers

Read Chapters 1-4 of Friedman’s The World is Flat


KNOWLEDGE

Database

PROCESS

Information ProcessingBusiness Rules, Procedures

INTERFACE

Input, OutputLocation, Security

BUSINESS CONTEXT

Hardware Software Networking

TECHNOLOGY DRIVERS

ERP, Object, Mobile,Collaborative, etc.

BUSINESS DRIVERS

BPR, CRM,SCM, e-Biz, etc.

KNOWLEDGE

Database

PROCESS

Information ProcessingBusiness Rules, Procedures

INTERFACE

Input, OutputLocation, Security

Business Data

Business Users

Hardware Software Networking

BUSINESS CONTEXT

Documents

1 Systems Analysis & Design System Development Environment : Participants and Context IS 431: Lecture 1 CSUN Information Systems dn58412/IS431/IS431_F15.htm