Systems Analysis And Design PDF

Systems analysis and design- is a disciplined process for creating high-quality enterprise information systems. Systems planning- is the first of five phases in the systems development life cycle. Information technology (IT)- refers to the combination of hardware, software, and services that peopl...

Systems analysis and design- is a disciplined process for creating high-quality enterprise information systems. Systems planning- is the first of five phases in the systems development life cycle. Information technology (IT)- refers to the combination of hardware, software, and services that people use to manage, communicate, and share information System analysis and design- is a step-by-step process for developing high-quality information systems information system - combines technology, people, and darn to provide support for business functions such as order processing, inventory control, human resources, accounting, and many more **5 components of Information system** Hardware, software, data, process and people **................................** System analyst - is a valued member of the IT department ream who helps plan, develop, and maintain information systems System- is a set of related components that produces specific results Mission critical system- is one that is vital to a company\'s operations. Data- consist of basic fact that are the system\'s raw material. Information- is data that has been transformed into output that is valuable to users. Hardware- consists of everything in the physical layer of the information system. Data center- large concentration of networked computers working together Gordon Moore-Moore's Law Software - refers to the programs that control the hardware and produce the desired information or results. Software consist of system software and application software System software- manages the hardware components, which can include a single computer or a global network with many thousands of clients Application Software- consists of programs that support day-to-day business functions and provide users with the information they need. company-wide applications, called enterprise applications include order processing systems, payroll systems, and company communication networks. **....................................** Application software- includes horizontal and vertical systems. Horizontal system- is a system, such as an inventory or payroll application, that can be adapted for use in many different types of companies. Vertical system- is designed to meet the unique requirements of a specific business or industry, such as an online retailer, a medical practice, or an auto dealership. Legacy systems- When planning an information system, a company must consider how a new system will interface with older systems. NoSql databases- Traditional relational models are srill use due to their ability to scale to extremely large and unstructured datasets. **...................................................................................** Process- describe the tasks and business functions that users, managers, and IT staff. Processes are the building blocks of an information system Stakeholders- People who have an interest in an information system Users- sometimes call end users Data breach- occurs when a hacker gains illegal access to a system and steals personal data. Business today is being shaped by three major trends: rapidly increasing globalization, rapid growth of cloud-based computing, technology integration Internet-based commerce **is called e-commerce (electronic commerce).** **Internet Business strategies** The internet model Business to consumer - is changing traditional business models and creating new ones. Business to business.......................... Electronic data interchange(EDI)- electronic commerce between two companies used a data sharing arrangement Supply chain management(SCM) Supply chain- refers to all the companies who provide materials, services, and functions needed m provide a product to a customer Modeling- produces a graphical representation of a concept or process that systems developers can analyze, test, and modify. Business profile- is an overview of a company\'s mission, functions, organization, products, services, customers, suppliers, competitors, constraints, and future direction. business profile is the starting point for the modeling process Business model- describes the information that a system must provide. Model based systems engineering (MBSE)- is one of the leading methods used by systems analysts co develop information systems Business process- is a specific set of transactions, events, and result Business process model- graphically displays one or more business processes, such as handling an airline reservation, filling a product order, or updating a customer account. System analyst- can describe and simplify an information system by using a set of business, data, object, network, and process models. Business process modeling notation(BPMN)- BPMN includes standard shapes and symbols to represent events, processes, workflows, and more. Systems developers- often use multipurpose charting tools such as lucidchart Lucidchart- is a popular tool that systems analysts can use to create business process diagrams, flowcharts, organization charts, network diagrams, floor plans, project timelines, and workflow diagrams, among others.................. Administrative staff used office systems Operational people used operational systems Middle managers used decision support systems Top managers used executive information systems............... Enterprise computing- refers to information systems that support company-wide operations and data management requirements. Enterprise resource planning(ERP)- systems provide cost effective support for users and managers throughout the company. Transaction processing systems (TP)- process data generated by day to day business operations............................ Business support system- provide job-related information support to users at all levels of a company. Top managers develop long-range plans, called strategic plans Structured analysis- which is a more recent approach that many analysts prefer Object oriented project- which is a more recent approach that many analysts prefer Agile methods - which include the latest trends in software development Project management- is the process of planning, scheduling, monitoring, controlling, and reporting upon the development of an information system. Structured analysis- traditional systems development technique that is time rested and easy co understand. Structured analysis uses a series of phases, called the Systems development life cycle (SDLC). Data flow diagram- the model which represents a school registration system. SDLC steps: System planning System analysis Systems design Systems implementation Systems support and security