New technologies

Ecommerce Enterprise resource

planning (ERP)

wireless and handheld

devices

open sourcesoftware

Information: is an organizational resource.

Costs are associated with information processing, like: production, distribution, security and storage.

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Categories:

Transaction processing systems ( TPS) :

Process large amounts of data for business transaction such as payroll and inventory

office automation systems (OAS):

Support data workers, analyze information to transform or manipulate data.

• Knowledge work systems (KWS):

Support professional workers like scientists and doctors.

• Management information systems(MIS):

Interaction between people and computers. Decision analysis and making.

• Decision support systems(DSS):

Support decision making in all phases.

• Expert systems (ES) and Artificial intelligence(AI):

Uses the knowledge of an expert to solve a problem.

• Group decision support systems(GDSS):

A group together to solve a problem with questionnaires, brainstorming and scenario creation.

• Executive support systems (ESS):

Interaction with external environment by providing communication support.

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Advantages of using the web :

Incerseing awareness . 24 hour acess for users Standard inetface design Creating global system .

Nature of analysis and design :

Identifying problems Analyzing the information . Desiging computerized information.

What does system analyst do ? ( tasks\properties )

Consultants to businesses Support experts in business Change agents Problem solver Must be ethical .

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The systems development life cycle : is a systematic approach to solving business problems .

phases Activities Personnel involved : 1Identifying:

Problems. Opportunities Objectives Activities

Interviewing.Summarizing the knowledge.Estimate the scope of project.Documenting the result.

Analyst.User management.Systems management

2Determining information requirements:

Interviewing.Gather systems. Questionnaires.Observe.

Analyst.User management.User operations workers.Systems management.

3

Analyzing system needs

Create data diagrams and document.Complete the data dictionary.

Analyst.User management.Systems management.

Make decisions.Prepare and present the system proposal.Recommend the optimal solution to management.

4Designing the recommended system

Design the user interface.Design system controlsDesign files.Produce program For programmers

Analyst.System designer.User management.User operations workers.Systems management

5Developing and documenting software

Design computer program.Write computer programs.Walkthrough program design.

Analyst.System designer.Programmers.Systems management.

6

Testing and maintaining the system

Test computer programs.Tests the computer system.Enhance system

Analyst.System designer.Programmers.Systems management.

7

Implementing and evaluating the system

Plan conversion.Train users.Install new equipment.Convert files.Install system.Review and evaluate system

Analyst.System designer.Programmers.User management.User operations workers.Systems management.

System maintenance : removing undetected errors and enhancing software . ( time spent 48-60%)

Reasons for enhancment the system :

Adding additional features . Requirments change over time Technology H\W and S\w change rapidly .

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Case tools : a software package for system analysis and design .

Reasons for using case tools :

Increase analyst productivity . Facilitate communication. Continuity between phases . Assess the impact of maintenance.

case tool categories

upper case tool

create and modify system

design store data

lower case tool

generate computer source code from case

design

integrated case

perform both upper and lower

case functions

Repository : collection of records , elements , diagrams and other project function.

Done by : Dana Dia'a