Systems Documentation: Systems Flowchart & Data Flow DiagramSystem DocumentationSystems FlowchartsStandard Flowcharting SymbolsCommon System Flowcharting RoutinesCommon System Flowcharting Routines …Common System Flowcharting Routines . . .Slide 8Slide 9Slide 10Slide 11Preparing Systems FlowchartsPreparing Systems Flowcharts . . .Slide 14Slide 15Slide 16Slide 17Suprina Systems FlowchartDocumenting Enterprise SystemsSuprina Systems Flowchart with an Enterprise DatabaseFlowchart SummaryProcess Modeling / DocumentationData Flow Diagrams SymbolsSlide 24Why System ModelingLogical Vs. Physical ModelsWhy Logical ModelsProcess Modeling with DFDSystem ConceptSystems & SubsystemsSystems & ProcessesDecomposition DiagramFunctional Decomposition DiagramEvent Decomposition DiagramData Flow DiagramsExternal EntitiesExternal Entities . . .Data StoresData Stores . . .Data FlowsProcessesTypes of ProcessesContext DiagramPowerPoint PresentationDFD Building ProcedureDFD Building Procedure . . .Rules in DFD BuildingRules in DFD Building . . .Slide 49Slide 50Slide 51Slide 52Slide 53Slide 54Slide 55Slide 56Slide 57Slide 58Slide 59Slide 60Rules in DFD Building ...Differences Between DFDs and FlowchartsData ConservationData to Process MatrixArchitecture BlueprintsArchitecture Blueprints . . .Architecture Blueprints . . .Slide 68Slide 69Linked ProcessesSlide 71DFD DeliverablesIS 630 : Accounting Information IS 630 : Accounting Information SystemsSystemshttp://www.csun.edu/~dn58412/IS630/IS630_F14.htmSystems Documentation:Systems Documentation:Systems Flowchart & Systems Flowchart & Data Flow DiagramData Flow DiagramLecture 3Lecture 3System DocumentationSystem DocumentationSystem Flowcharts present a comprehensive picture of the management, operations, information systems, and process controls embodied in business processes.Data Flow diagrams (DFD) portray a business process activities, stores of data, and flows of data among those elements. IS 630 : Lecture 3 2Systems FlowchartsSystems FlowchartsSystems Flowchart: a graphical representation of a business process, including information processes (inputs, data processing, data storage, and outputs), as well as the related operations processes (people, equipment, organization, and work activities).( Also known as “process flowcharts” and “business process flowcharts”, “document flowcharts”)IS 630 : Lecture 3 3Standard Flowcharting Standard Flowcharting SymbolsSymbolsIS 630 : Lecture 3 4Common System Flowcharting RoutinesEnter document into computer via keyboard, edit input, record input.(Note that columns are set up to communicate the flow of activities between processing entities.)IS 630 : Lecture 35Common System Flowcharting Routines …User queries the computerIS 630 : Lecture 36Common System Flowcharting Routines . . .Update sequential data storeIS 630 : Lecture 37Common System Flowcharting Routines . . .Preparation and then manual reconciliation of control totals.IS 630 : Lecture 38Common System Flowcharting Routines . . .Key and rekey to verify inputsIS 630 : Lecture 39Common System Flowcharting Routines . . .Enter document intocomputer using a scannerIS 630 : Lecture 310Common System Flowcharting Routines . . .Enter document into computer using scanner and then manual keyingIS 630 : Lecture 311Preparing Systems FlowchartsPreparing Systems Flowcharts1. Divide the flowchart into columns (areas of responsibilities): one column for each internal entity and one for each external entity. Label each column.2. Flowchart columns should be laid out so that the flowchart activities flow from left to right. But, minimize crossed lines and connectors.3. Flowchart logic should flow from top to bottom and from left to right. For clarity, put arrows on all flow lines.IS 630 : Lecture 3 12Preparing Systems Preparing Systems Flowcharts . . .Flowcharts . . .4. Keep the flowchart on one page, if possible. With multiple pages use off-page connectors. 5. Within each column, there must be at least one manual process, keying operation, or data store between documents. Do not directly connect documents within the same column.6. When crossing organizational lines (one column to another), show a document at both ends of the flow line unless the connection is so short that the intent is unambiguous.IS 630 : Lecture 3 13Preparing Systems Preparing Systems Flowcharts . . .Flowcharts . . .7. Documents or reports printed in a computer facility should be shown in that facility’s column first. Then show the document or report going to the destination unit.8. Documents or reports printed by a centralized computer facility on equipment located in another organizational unit should not be shown within the computer facility.IS 630 : Lecture 3 14Preparing Systems Preparing Systems Flowcharts . . .Flowcharts . . .9. Processing within an organizational unit on devices such as a PC, laptop, or computerized cash register should be shown within the unit or as a separate column next to that unit, but not in the central computer facility column. 10.Sequential processing steps (computerized or manual) with no delay between them (and resulting from the same input) can be shown as one process or as a sequence of processes.IS 630 : Lecture 3 15Preparing Systems Preparing Systems Flowcharts . . .Flowcharts . . .11.The only way to get data into or out of a computer data storage unit is through a computer processing rectangle or offline process square.12.Manual process is not needed to show the sending of a document; sending should be apparent from the movement of the document.13.Do not use manual processes to file documents; show documents going into files.IS 630 : Lecture 3 16Preparing Systems Preparing Systems Flowcharts . . .Flowcharts . . .All documents must have an origin and termination: each copy of the document must flow to•a permanent file symbol•a symbol denoting an exit from the system, or•an off-page connector•a document destruction symbol (small black box)•“cradle to grave” documentationMake sure progress of a document is clear. Diagram a document •before and after each process •entering or leaving a file •entering or leaving a page or area of responsibilityIS 630 : Lecture 3 17SuprinaSuprina Systems Flowchart Systems FlowchartIS 630 : Lecture 3 18Documenting Enterprise Documenting Enterprise SystemsSystemsMoving from a file-based system to an enterprise database changes the systems flowchart.•An enterprise database replaces