system analysis and design chapter 1 Kendall & Kendall
- 1. New technologies Ecommerce Enterprise resource planning(ERP) wireless and handheld devices open source software Information:isan organizational resource. Costs are associatedwithinformation processing, like:production, distribution, securityand storage. =========================================================================== Categories: Transaction processing systems ( TPS) : Process large amountsof data for businesstransactionsuchaspayroll and inventory office automation systems (OAS): Supportdata workers, analyze informationtotransformor manipulate data. • Knowledge work systems (KWS): Supportprofessionalworkerslike scientistsanddoctors. • Management information systems(MIS): Interaction betweenpeople and computers. Decision analysisandmaking. • Decision support systems(DSS): Supportdecisionmakinginall phases. • Expert systems (ES) and Artificial intelligence(AI): Uses the knowledgeof anexperttosolve aproblem. • Group decision support systems(GDSS): A grouptogethertosolve a problemwith questionnaires, brainstormingand scenariocreation. • Executive support systems (ESS): Interaction withexternalenvironmentbyprovidingcommunicationsupport. ===========================================================================
- 2. 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 systemanalyst do? ( tasksproperties ) Consultants to businesses Support experts in business Change agents Problem solver Must be ethical . =========================================================================== The systems development life cycle :is a systematicapproachtosolvingbusiness problems. phases Activities Personnel involved : 1 Identifying: Problems. Opportunities Objectives Activities Interviewing. Summarizing the knowledge. Estimate the scope of project. Documenting the result. Analyst. User management. Systems management 2 Determining information requirements: Interviewing. Gather systems. Questionnaires. Observe. Analyst. User management. User operations workers. Systems management. 3 Analyzing systemneeds Create data diagrams and document. Complete the data dictionary. Make decisions. Prepare and present the system proposal. Recommend the optimal solution to management. Analyst. User management. Systems management.
- 3. 4 Designing the recommended system Design the user interface. Design systemcontrols Design files. Produce program For programmers Analyst. System designer. User management. User operations workers. Systems management 5 Developing 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:removingundetectederrorsandenhancingsoftware.( time spent 48-60%) Reasons for enhancment the system: Adding additional features . Requirments change over time Technology HW and Sw change rapidly . =========================================================================== Case tools : a software package forsystemanalysisanddesign. Reasons for using case tools : Increase analyst productivity . Facilitate communication. Continuity between phases . Assess the impact of maintenance. Repository : collectionof records,elements,diagramsandotherprojectfunction.
- 4. case tool categories upper case tool create and modify system design store data lowercase tool generate computersource code from case design integratedcase performboth upperand lower case functions Done by : Dana Dia'a