'COMPUTERIZED SYSTEM Essay\r'

'Systems techniques are tools utilise in the analysis, design, and bread and butter of arranging and subsystem relationships. They are largely graphical (pictorial) in nature. Systems techniques are occasiond by accountants who do systems work.\r\n rollation includes the following types of tools:\r\nNarratives ( indite descriptions)\r\nFlowcharts\r\nDiagrams\r\nOther written material\r\nFor this subject, we only need to controvert devil (2) of the most common documentation tools: data strike diagrams\r\nGraphical descriptions of the sources and destinations of data. They rise: Where data comes from\r\nHow it campaigns\r\nThe processes performed on it\r\nWhere it goes\r\nInclude three types:\r\nDocument flowcharts make the flow of documents and nurture between departments or units. System flowcharts describe the relationship between inputs, processing, and outputs for a system. political programme flowcharts describe the sequence of logical trading operations perfor med in a computer program DATA FLOW DIAGRAMS A data flow diagram (DFD) graphically describes the flow of data within an organization. It is used to: Document existing systems\r\nPlan and design newfound systems\r\nThere is no black-and-white set about to developing a DFD.\r\nData sources and destinations\r\n come in as squares\r\nRepresent organizations or individuals that pose or receive data used or produced by the system An item can be both a source and a destination\r\nData flows\r\nAppear as arrows\r\nRepresent the flow of data between sources and destinations, processes, and data stores As you probably surmised(GUESS) from the previous slides, if a data flow is two-way, use a bi-directional arrow.If two data elements flow together, then the use of one data flow arguing is appropriate.\r\n'