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 \nCopyright ©2019 John Wiley & Sons, Inc. 4  \nReading a Data Flow Diagram  \nCopyright ©2019 John Wiley & Sons, Inc. 5  \nDFD Elements (1 of 7)  \n• Process  \n• An activity or function performed for a specific business reason  \n• Can be manual or computerized  \n• Includes the following:  \n• A number  \n• A name (verb phrase)  \n• A description  \n• At least one output data flow  \n• At least one input data flow  \nCopyright ©2019 John Wiley & Sons, Inc. 6  \nDFD Elements (2 of 7)  \n• Process  \n• Logical process models omit any processes that simply move or route data and leave the data unchanged.  \n• You do include logical processes that:  \n• Perform computations (e.g., calculate grade point average)  \n• Make decisions (e.g., determine availability of ordered products)  \n• Sort, filter or otherwise summarize data (e.g., identify overdue invoices)  \n• Organize data into useful information (e.g., generate areport or answer a question)  \n• Trigger other processes (e.g., turn on the furnace or instruct a robot)  \n• Use stored data (create, read, update or delete a record)  \nCopyright ©2019 John Wiley & Sons, Inc. 7  \nDFD Elements (3 of 7)  \n• Data flow  \n• A single piece of data or a logical collection of data  \n• Data Flow names describe the content of the data flow but not how it is implemented  \n• Always starts or ends at a process  \n• Includes the following:  \n• A name (noun)  \n• Description  \n• One or more connections to a process  \nCopyright ©2019 John Wiley & Sons, Inc. 8  \nDFD Elements (4 of 7)  \n • Data flow  \n• A data flow is data in motion .  \n• an input of data to a process, or the output of data (or information) from a process .  \n• the creation, deletion, or update of data ina file or database (called a data store on the DFD) .  \n• A data flow is depicted as a solid-line with arrow.   \n• Control flows (non-data flows) trigger processes, such as ‘time to run the weekly payroll’  \n• The control flow is depicted as a dashed-line with arrow.   \nCopyright ©2019 John Wiley & Sons, Inc. 9  \nDFD Elements (5 of 7)  \n• Data Store  \n• Most information systems capture data for later use .  \n• A data store is a collection of data that is stored in some way  \n• Include the following:  \n• A number  \n• A name (noun)  \n• Description  \n• One or more input data flows (somewhere in process model)  \n• One or more output data flows (somewhere in process model)  \nCopyright ©2019 John Wiley & Sons, Inc. 10","cbCaiuauGvaaEFNi","https://ap.wps.com/l/cbCaiuauGvaaEFNi","pdf",1832198,43,"English","# Learning Objectives\n# Key Definitions\n# Data Flow Diagrams\n## Reading a Data Flow Diagram\n# DFD Elements (1-7)\n## Process\n## Data Flow\n## Data Store","[{\"question\":\"What is the difference between logical and physical process models?\",\"answer\":\"Logical process models describe processes without indicating how they are conducted. Physical process models include implementation information.\"},{\"question\":\"What does a DFD process represent?\",\"answer\":\"A process is an activity or function performed for a specific business reason and can be manual or computerized. It includes a number, a verb-phrase name, a description, and at least one input and output data flow.\"},{\"question\":\"How is data flow depicted and what does it connect?\",\"answer\":\"A data flow is data in motion and is shown as a solid-line arrow. It always starts or ends at a process and includes a noun name, a description, and one or more connections to processes.\"}]","Chapter 5 - Process Modeling - Learning Objectives, Key Definitions, and DFD Elements | PDF",1792965255,108]