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Bodnar/Hopwood AIS 7th Ed1 Chapter 2 u Systems Techniques and Documentation.

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Presentation on theme: "Bodnar/Hopwood AIS 7th Ed1 Chapter 2 u Systems Techniques and Documentation."— Presentation transcript:

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2 Bodnar/Hopwood AIS 7th Ed1 Chapter 2 u Systems Techniques and Documentation

3 Bodnar/Hopwood AIS 7th Ed2 Compliance vs Substantive Testing u Compliance Testing l confirms l assesses l checks u the continuity of operation of internal controls (IC)

4 Bodnar/Hopwood AIS 7th Ed3 Compliance vs Substantive Testing u Substantive Testing l verifies u financial statements

5 Bodnar/Hopwood AIS 7th Ed4 Types of Flowcharts u IPO and HIPO u Systems and Program u Analytic and Document

6 Bodnar/Hopwood AIS 7th Ed5 IPO and HIPO u primarily narrative in nature u used primarily by systems development personnel

7 Bodnar/Hopwood AIS 7th Ed6 Commonly Used Flowcharts Document Flowcharts Systems Flowcharts Program Flowcharts Data Flow Diagrams

8 Bodnar/Hopwood AIS 7th Ed7 Document Flowcharts u Flowcharts are pictorial representations of transaction processing systems that portray flows of some type. u A Document Flowchart emphasizes the hardcopy inputs and outputs and their flows through organizational units. u Auditors and accountants may use document flowcharts when analyzing a current system for weaknesses in controls and reports.

9 Bodnar/Hopwood AIS 7th Ed8 A Sample Document Flowchart Requesting DepartmentCentral Supplies Department Goods Requisition Form A A Goods Requisition Form 12 File 1

10 Bodnar/Hopwood AIS 7th Ed9 Systems Flowchart u a pictorial or graphical representation of the overall flow of work, documents, and operations in a system u systems flowcharts are used by both auditors and systems development personnel

11 Bodnar/Hopwood AIS 7th Ed10 System Flowcharts u They use symbols that are industry conventions standardized by the American National Standards Institute (ANSI). u Flowcharting symbols are grouped as input- output symbols, processing symbols, storage symbols, data and information flow symbols, and miscellaneous symbols.

12 Bodnar/Hopwood AIS 7th Ed11 Invoice (A) Single Document Shipping Receipt (B) Overlapping symbols- same document Sales Invoice 4 (C) Two overlapping symbols - same document Sales Order 3 Invoice 2 (D) Two overlapping symbols - different documents Flowchart Symbols: Documents

13 Bodnar/Hopwood AIS 7th Ed12 (A) On-line Manual Device (B) Terminal Display (C) I/O (Input/Output) (D) Manual Process (E) On-line Computer Process (F) Off-line or Noncomputer Process (H) On-line Data Storage (J) Magnetic Tape Storage Permanent File (G) Off-line Paper File Temporary File N A (I) Disk Storage Flowchart Symbols

14 Bodnar/Hopwood AIS 7th Ed13 (E) Annotation (F) Decision (G) Calculator/ Register Tape (H) Physical Object (I) Flow Lines (J) Communication Link (A) Enter/Exit System To Customer From Bank (B) Start (or end) Process Start (C) On-page Connectors 1 1 Indicates the flow will continue at the on-page connector #1 Indicates where the flow continues from the on-page connector #1 (D) Off-page Connectors p p.2 on page 2: on page 4: to page 4 connector #1 from page 2 Flowchart Symbols

15 Bodnar/Hopwood AIS 7th Ed14 Systems Flowcharting Guidelines u Sketch a flowchart before designing the final draft. u Use annotated descriptions and comments in flowcharts for clarification. u Within a file symbol, (a) may be placed to show alphabetic storage or documents, (c) for chronological, and (n) for numeric.

16 Bodnar/Hopwood AIS 7th Ed15 Systems Flowcharting Guidelines u Flowcharts should read from top to bottom and left to right. u Use appropriate symbols; the variety should be limited for clarity. u Sandwich rule - a process symbol should always be found between an input and an output symbol. u Use connectors to avoid crossed lines and cluttered flowcharts.

17 Bodnar/Hopwood AIS 7th Ed16 Flowchart Element : Flow Lines u Flow lines are used to connect the symbols on the document flow chart. u A solid line indicates the flow of a document or object u A dotted or dashed symbol indicates a flow of information rather than the physical document

18 Bodnar/Hopwood AIS 7th Ed17 Flowchart Element : Flow Lines u Arrows are used when the documents or information flow is not left-to-right or top- to-bottom u Some flowcharts also show communication flows such as by telephone modem or satellite

19 Bodnar/Hopwood AIS 7th Ed18 Flowcharting Element: Area of Responsibility u Areas of responsibility are displayed to enable the flowchart reader to clearly identify changes in responsibility as the documents flow through the system. u They are represented on flowcharts by segmenting and labeling columns.

20 Bodnar/Hopwood AIS 7th Ed19 Flowcharting Element: Area of Responsibility u Areas of responsibility may be departments, sections within a department, or individual employees within a department. u Judgment must be used in choosing the level of subdivision that one column should represent.

21 Bodnar/Hopwood AIS 7th Ed20 Preparation Conventions u Left-to-right, Top-to-bottom u All documents must have an origin and termination l indicate origin by darkening one corner of the symbol l each copy of the document must flow to u a permanent file symbol u a symbol denoting an exit from the system, or u Keep flowcharts uncluttered l place areas with frequent interchange in adjacent columns l enter narrative only in symbols l Make sure progress of a document is clear. Diagram a document

22 Bodnar/Hopwood AIS 7th Ed21 Preparation Conventions u an off-page connector u a document destruction symbol (small black box) u “cradle to grave” documentation u before and after each process l entering or leaving a file l entering or leaving a page or area of responsibility u Make sure the flowchart is complete

23 Bodnar/Hopwood AIS 7th Ed22 Program Flowchart u a flowchart indicating detailed processing functions u program flowcharts are used primarily by systems development personnel

24 Bodnar/Hopwood AIS 7th Ed23 Logical Data Flow Diagrams u Shows the system’s processes and the flows of data into and out of the processes, i.e., provides a logical view of the system. u Represents what tasks the system is doing, without emphasis on how, where, or by whom the tasks are being performed. u Appropriate for a macro-view of the system.

25 Bodnar/Hopwood AIS 7th Ed24 Data Flow Diagrams (DFD) u Data flow diagramming symbols are used for a variety of system analysis purposes, including graphically displaying the logical flows of data through a process. u Unlike flowcharts which represent the physical components of an information system, data flow diagrams can provide a more conceptual, nonphysical display of the movement of data through a system.

26 Bodnar/Hopwood AIS 7th Ed25 Data Flow Diagrams (DFD) u Data flow diagrams disregard such things as organizational units, the computer on which the data are processed, and the media on which the data are stored. u The movement of data across offices or departments within a particular system environment are not represented.

27 Bodnar/Hopwood AIS 7th Ed26 (A) Process (B) Data inflow sources, information outflow destinations (C) Data store (D) Data flow lines Data Flow Diagram Symbols

28 Bodnar/Hopwood AIS 7th Ed27 (A) Process Data Flow Diagram Symbols u Process l Circles are used to represent processes that take data inflows and transform them to information outflows. l The circle contains two labels. l The first label is a process number (explained later) and the second is a process name. l Some use rectangular boxes with rounded corners.

29 Bodnar/Hopwood AIS 7th Ed28 Data Flow Diagram Symbols u Data Sources and Sinks l Rectangles (or squares) represent data (inflow) sources and (information outflow) sinks l The rectangle is labeled with the name of the data source or sink/destination (e.g. Customer, Vendors, Government Agency). l The sources and sinks play an important role in the data flow diagram. l (B) Data inflow sources, information outflow destinations

30 Bodnar/Hopwood AIS 7th Ed29 Data Flow Diagram Symbols l The sources and sinks are agents external to (i.e. outside the scope of) the system represented on the diagram. l They delineate the boundaries of the system.

31 Bodnar/Hopwood AIS 7th Ed30 Data Flow Diagram Symbols u Data Stores l Two parallel straight lines are used to display a store or collection of data. l Some people refer to data stores as data at rest. l A description of the data store contents is entered on the symbol. l Data stores are used anytime it is necessary to store the output from a process before sending it on to the next process. l (C) Data store Inventory

32 Bodnar/Hopwood AIS 7th Ed31 Data Flow Diagram Symbols l Some use a rectangular box that is open at one end.

33 Bodnar/Hopwood AIS 7th Ed32 Data Flow Diagram Symbols u Data Flow Lines l Data flow lines display the route of data inflow and information outflow. l They can be straight or curved lines. l The data flow is generally labeled with the name of the data (e.g. a customer order, a bill, a financial analysis) and the arrow indicates the direction of the data flow. (D) Data flow lines

34 Bodnar/Hopwood AIS 7th Ed33 Constraints: General Rules ¬All processes should have unique names. If two data flow lines (or data stores) have the same label, they should both refer to the exact same data flow (or data store). ­The inputs to a process should differ from the outputs of a process. ®Any single DFD should not have more than about seven processes.

35 Bodnar/Hopwood AIS 7th Ed34 Constraints: Process Rules ¯No process can have only outputs. (This would imply that the process is making information from nothing.) If an object has only outputs, then it must be a source. °No process can have only inputs. (This is referred to as a “black hole”.) If an object has only inputs, then it must be a sink. ±A process has a verb phrase label. Incorrect Correct Incorrect Correct Edit

36 Bodnar/Hopwood AIS 7th Ed35 Constraints: Data Store ²Data cannot move directly from one data store to another data store. Data must be moved by a process. ³Data cannot move directly from an outside source to a data store. Data must be moved by a process that receives data from the source and places the data in the data store. ´Data cannot move directly to an outside sink from a data store. Data must be moved by a process. No Yes No

37 Bodnar/Hopwood AIS 7th Ed36 Constraints: Data Store u A data store has a noun phrase label. CUSTOMER

38 Bodnar/Hopwood AIS 7th Ed37 Constraints: Source/Sink Data cannot move directly from a source to a sink. It must be moved by a process if the data are of any concern to the system. If data flows directly from a source to a sink (and does not involved processing) then it is outside the scope of the system and is not shown on the system data flow diagram DFD. A source/sink has a noun phrase label. Correct Customer Incorrect

39 Bodnar/Hopwood AIS 7th Ed38 Constraints: Data Flow A data flow has only one direction between symbols. It may flow in both directions between a process and a data store to show a read before an update. To effectively show a read before an update, draw two separate arrows because the two steps (reading and updating) occur at separate times. A fork in a data flow means that exactly the same data goes from a common location to two or more different processes, data stores, or sources/sinks. (This usually indicates different copies of the same data going to different locations.) No Yes A B A A No Yes

40 Bodnar/Hopwood AIS 7th Ed39 Constraints: Data Flow. A join in a data flow means that exactly the same data comes from any of two or more different processes, data stores, or sources/sinks, to a common location. A data flow cannot go directly back to the same process it leaves. There must be at least one other process that handles the data flow, produces some other data flow, and returns the original data flow to the originating process. A data flow to a data store means update (i.e., delete, add, or change). A data flow from a data store means retrieve or use. A data flow has a noun phrase label. More than one data flow noun phrase can appear on a single arrow as long as all of the flows on the same arrow move together as one package.

41 Bodnar/Hopwood AIS 7th Ed40 Context Diagram context diagram u The highest level of data flow diagrams is the context diagram. single system u A single system is represented on a context diagram and it provides the scope of the system being represented identified in a process symbol in the center of the diagram labeled with a 0. one process sources/sinks u The context diagram shows one process (representing the entire system) and the sources/sinks that represent the boundaries of the system. context diagram u The highest level of data flow diagrams is the context diagram. single system u A single system is represented on a context diagram and it provides the scope of the system being represented identified in a process symbol in the center of the diagram labeled with a 0. one process sources/sinks u The context diagram shows one process (representing the entire system) and the sources/sinks that represent the boundaries of the system.

42 Bodnar/Hopwood AIS 7th Ed41 Context Diagram data flow lines u The data flow lines into the process represent the input data to the system (provided by sources) and the data flow lines from the process represent the output information from the system (going to the sinks).

43 Bodnar/Hopwood AIS 7th Ed42 Internal Departments Customers Management Investors and Creditors 0 Events Driven System Reports Financial Statements Internal Events External Events Context Level Diagram Events Driven System

44 Bodnar/Hopwood AIS 7th Ed43 Level Zero DFD Example Customers Decision Makers 1.0 Process Customer Orders 2.0 Deliveries to Customers 3.0 Process Payments Desired Information Bill Order Desired Information Payments Accounts Receivable Shipping Request

45 Bodnar/Hopwood AIS 7th Ed44 External event: Record Sale of Merchandise Prepare Sales Invoice 1.1 Sale Event Data Review Customer Credit 1.2 Sales Invoice Data Record Sales Event Data 1.3 Approved Sales Invoice Data Level One - Record Event Data

46 Bodnar/Hopwood AIS 7th Ed45 Factory supervisor Review time cards Record weekly wages Time cards Reviewed time cards Employee Earnings Records Time card file (alpha) Example Data Flow DiagramExample Flowchart Version 1 Factory Supervisor Accounting Payroll Clerk 1 2 N Time cards Review time cards A Record wages Employee Earnings Records 1 2 N Time cards A= alphabetic

47 Bodnar/Hopwood AIS 7th Ed46 Analytic Flowchart u charts the flow of documents and processing between different entities - which are represented by separate columns in the flowchart. u Examples of analytic flowcharts Examples of analytic flowcharts

48 Bodnar/Hopwood AIS 7th Ed47 Analytic flowcharts and Internal Control Analysis u the grouping of functions facilitates analysis of segregation of duties u interfaces between entities are emphasized u interfaces are important control points in a system


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