Revised09final - Controlling Information Systems Business...

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Unformatted text preview: Controlling Information Systems: Business Process Controls Learning Objectives • • • • • • Understand steps in control framework Know how to prepare control matrix Comprehend the generic business process control plans introduced in this chapter Be able to describe how the business process controls accomplish control goals Appreciate the importance of controls to organizations with enterprise systems Appreciate the importance of controls to organizations engaging in e-Business Business Process Controls Process Controls Hub of the AIS Wheel • In this chapter, we spotlight one layer of controls—process controls—as indicated by the AIS Wheel. • First, you will learn how to assess the nature and extent of process control goals by decomposing them into operation process goals and information process goals. • Further, operations process goals are subdivided into effectiveness, efficiency, and security goals; and information process goals are split into input and update goals. • For each category of control goals, you will recommend effective control plans. • When control goals and plans are combined, you will understand how to develop the control matrix, which will serve as the basis for evaluating process controls in later chapters. 3 The Control Matrix • The control matrix is a tool designed to assist you in analyzing a systems flowchart and related narrative. • It establishes the criteria to be used in evaluating the controls in a particular business process. 4 Sample Control Matrix 5 Steps in Preparing Control Matrix I. Specifying control goals represents the first step in building a control matrix. The goals are listed across the top row of the matrix. 1. Identify the operations process goals a. Effectiveness goals b. Efficiency goals c. Security goals 2. Identify Information Process Goals a. Input Goals b. Update Goals 6 Operations Process Goals: – Effectiveness Goal – Ensure the successful accomplishment of the goals set forth for the business process – Labeled A - zzz – Efficiency Goal – to ensure that all resources used throughout the business process are being employed in the most productive manner – Parenthetically (list resources for which efficiency is applicable) – People & Computers Always, others depending on Process/Goal – Security Goal – to ensure that entity resources are protected from loss, destruction, disclosure, copying, sale, or other misuse. – Parenthetically (list resources needed to be secured) 7 Information Process Goals • • • • • Input Goals Ensure input validity (IV) Ensure input completeness (IC) and Ensure input accuracy (IA) Name the Input data () • • • • Update Goals Ensure update completeness (UC) and Ensure update accuracy (UA) Name the Update data () 8 Steps in Preparing the Control Matrix I. 1. 2. 3. Recommending Control Plans Annotating “Present” Control Plans Evaluating “Present” Control Plans Identifying and Evaluating “Missing” Control Plans 9 Causeway Annotated Systems Flowchart 10 Annotating Present Control Plans • Start on the upper left-hand column of the systems flowchart and spot the first manual keying symbol, manual process symbol, or computer process symbol (process related symbols) • Then, follow the sequential logic of the systems flowchart and identify all of the process-related symbols. • Each process-related symbol reflects an internal control plan which is already present. • It is important to recognize that while a control plan may be present, it may not be working as effectively as it should; thus, you might recommend ways to strengthen or augment existing control plans 11 Annotate the Process Flow Chart • Review the flowchart and determine whether a control is present (P-) or missing (M-) • Annotate the flowchart – If controls are present, mark P– If controls are absent, mark M- 12 Annotating Present Control Plans a. Reviewing the Causeway systems flowchart (Figure 9.2), you will find that the first processrelated symbol is entitled “Endorse checks.” – Because this process appears on the flowchart, this control plan already exists, meaning, it is present as opposed to missing. – Accordingly, place a P- beside the process, indicating that is it present, and a 1 beside the P- reflecting the first present control plan on the flowchart. – As a result, you should have annotated the systems flowchart with a P-1. 13 Annotating Present Control Plans a. Continue reviewing the systems flowchart by following its sequential logic, annotating the flowchart with P2, P-3, and so on until you have accounted for all present control plans. Notice on the Flowchart (Figure 9-2), that nine control plans (P-1–P-9) are already present at Causeway. 14 Evaluating “Present” Control Plans: • Write number (P-1, P-2, P-3 through P-n) and name of each control plan in the left-hand column of the control matrix. • Then, starting with P-1, look across the row and determine which control goals the plan addresses and place a P-1 in each cell of the matrix for which P-1 is applicable. • It is possible that a given control plan can attend to more than one control goal. • Continue this procedure for each of the present control plans. • Simultaneously, in the legend of the matrix, describe how the control plan addresses each noted control goal. 15 Causeway Annotated Systems Flowchart 16 Identifying and Evaluating “Missing” Control Plans: • The next step in recommending control plans is to determine if additional controls are needed to address missing control goal areas, strengthen present control plans, or both. 17 Identifying and Evaluating “Missing” Control Plans: • • Examining the controls matrix: The first place to start is to look at the control matrix and see if there are any control goals (operations or information) for which no present control plan is addressing. If so, you need to do the following: i. In the left-hand column of the matrix, number the first missing control plan as M-1 and label or title the plan. ii. Across the matrix row, place M-1 in each cell for which the missing control is designed. iii. In the legend of the matrix, explain how the missing control will address each noted control goal. iv. On the systems flowchart, annotate M-1 where the control should be inserted. v. If there are still control goals for which no control plan has addressed, develop another plan (M-2) and repeat the four previous steps (i through iv). Continue this procedure until each control goal on the matrix is addressed by at least one control plan. • • With regard to Causeway, we have noted two missing control plans in the sample control matrix for the Cash Receipts Business Process M-1 and M-2, although more might exist 18 Evaluating the systems flowchart: • Even though all of the control goals on the matrix are now addressed, closely review the systems flowchart one more time. • Look for areas where further controls are needed. • Just because all control goals on the matrix have one or more associated control plans, we might have to to add more control plans or strengthen existing plans to reduce residual risk to an acceptable level in certain areas. • It takes training and experience to spot risks and weaknesses of this nature • In Chapters 10 through 16 you will learn more about how to make such critical internal control assessments. 19 Sample Control Plans for Data Input 1. Processing input data without access to master data 2. Processing input data with access to master data 3. Batch input 20 Processing input data without access to master data • Because systems without master data require manual keying of data (an error prone process), special controls are necessary to ensure control goals are met – Entry w/o master data implies that a database does not exist or is unavailable to verify data – This makes controls over entry of data more important 21 Data Entry Without Master Data 22 Available Control Plans for Data Input • Note that the first process-related symbol appears as “key document” in the first column (data entry clerk 1). – P-1: Document Design—source document is designed to easily complete and key data – P-2: Written Approvals—signature or initials indicating approval of event processing – P-3: Preformatted Screens—defines acceptable format for each data field (e.g., 9 numeric characters for SSN) – P-4: Online Prompting—requests user input or asks questions, e.g., message box 23 Available Control Plans for Data Input, Cont’d. • The next process-related symbol (edit input) appears in the second column (data entry devices). • P-5: Programmed Edit Checks – Automatically performed by data entry programs upon entry of data • Reasonableness checks (limit checks)—tests input for values within predetermined limits • Document/record hash totals—compares computer total to manually calculated total • Mathematical accuracy checks—compare calculations performed manually to computer calculations, e.g., compare invoice total to manually entered to computer calculated total • Check Digit verification – a functionally dependent extra digit is appended to a number; if miskeying occurs, a check digit mismatch occurs and the system rejects the input 24 Available Control Plans for Data Input • P-6: Procedures for rejected input—rejected inputs are corrected and resubmitted for processing • P-7: Keying corrections—clerk corrects inputs • P-8: Interactive feedback checks—computer informs clerk that input has been accepted/rejected • P-9: Record input—record is recorded in transaction data rather than being re-keyed at another time • M-1: Key verification—data is keyed by two different individuals then compared by the computer 25 Control Matrix w/o Master Data 26 Control Plans for Data Entry With Master Data • When standing (master) data is present, data entered can be verified by existing data providing additional data-entry controls – Data entry with master data implies the presence of an existing database populated with data – Data in the database is used to populate entry forms or is compared to data entered • If we have available the actual customer master data, we can use the customer number to call up the stored customer master data and determine if the customer number has been entered correctly, if the customer exists, the customer’s correct address, and so forth. • In the next section we describe the additional controls available to us when master data is available during data entry. 27 Systems Flowchart: Data Entry With Master Data 28 Recommended Control Plans with Master Data • P-1: Enter data close to originating source – Input data is entered directly and immediately it reduces input costs, inputs are less likely to be lost, errors are less likely and can more easily corrected – Online transaction entry (OLTE), online real-time processing (OLRT), and online transaction processing (OLTP) are all examples of this processing strategy. • P-2: Digital signatures – Authenticate that the sender of the message has the authority to send it and detects messages that have been altered in transit – an application of public key cryptography involving the use of a private encryption key to “sign” the data transmitted 29 Recommended Control Plans with Master Data • P-3: Populate input with master data – User enters an entity’s ID code and the system then retrieves certain data about that entity from existing master data. – User might be prompted to enter the customer ID (code). – By accessing the customer master data, the system automatically provides data such as the customer’s name and address, the salesperson’s name, and the sales terms. – This reduces the number of keystrokes required, making data entry quicker, more accurate, and more efficient. – Therefore, the system automatically populates input fields with existing data 30 Recommended Control Plans with Master Data • P-4: Compare input data with master data—the system compares inputs with standing (master) data to ensure their accuracy and validity – Input/master data dependency checks • These edits test whether the contents of two or more data elements or fields on an event description bear the correct logical relationship. • For example, input sales events can be tested to determine whether the salesperson works in the customer’s territory. • If these two items don’t match, there is some evidence that the customer number or the salesperson identification was input erroneously. – Input/master data validity and accuracy checks • These edits test whether master data supports the validity and accuracy of the input. For example, this edit – might prevent the input of a shipment when no record of a corresponding customer order exists. – If no match is made, we may have input some data incorrectly, or the shipment might simply be invalid. • We might also compare elements within the input and master data. 31 Recommended Control Plans with Master Data • P-5: Procedures for rejected inputs – After processing the input, the user compares the input with the master data to determine whether the input either is acceptable or contains errors, and that any errors are corrected and resubmitted • P-6: Key Corrections – The clerk completes the procedures for rejected inputs by keying the corrections into the computer thus ensuring that the input is accurate. • P-7: Record Input – Once all necessary corrections are made, the user accepts the input. – This action triggers the computer to simultaneously record the input in the transaction file and inform the user that the input data has been accepted. • P-8: Interactive Feedback Checks – These interactive programmed features inform the user that the input has been accepted and recorded or rejected for processing. 32 Control Matrix Data Entry with Master Data 33 Data Entry with Batches • Data entry with batches involves collecting inputs into work units called batches; batched inputs are then keyed into system as a batch – Implies some delay between the economic event and its reflection in the system – Allows for controls focusing on the batch, e.g., batch control totals (hash or other totals from batch) – Batch entry is often followed by an exception and summary report 34 Data Entry With Batches 35 Batch Control Plans • Batch control plans, to be effective, should ensure that: – All documents are included in batch – All batches are submitted for processing – All batches are accepted by computer – All differences are disclosed, investigated and corrected on a timely basis 36 Batch Control Plans • Batch control procedures start by grouping event data and calculating totals for the group: Several different types of batch control totals can be calculated – Document/record counts are simple counts of the number of documents entered in a batch • This procedure represents the minimum level required to control input completeness. • Because one document could be intentionally replaced with another, this control is not effective for ensuring input validity and says nothing about input accuracy. – Item or line counts • Counts number of items or lines entered, such as a count of the number of invoices being paid by all the customer remittances. • By reducing the possibility that line items or entire documents could be added to the batch or not be input, this control improves input validity, completeness, and accuracy. • Remember, a missing event record is a completeness error and a data set missing from an event record is an accuracy error. – Dollar totals • Sum of dollar value of items in batch • By reducing the possibility that entire documents could be added to or lost from the batch or that dollar amounts were incorrectly input, this control improves input validity, completeness, and accuracy. – Hash totals • Are a summation of any numeric data existing for all documents in the batch, such as a total of customer numbers or invoice numbers in the case of remittance advices. • Unlike dollar totals, hash totals normally serve no purpose other than control. • Hash totals can be a powerful batch control because they can determine if inputs have been altered, added, or deleted. • These batch hash totals operate for a batch in a manner similar to the operation of document/record hash totals for individual inputs. 37 P-1: Receive turnaround documents • Turnaround documents are used to capture and input a subsequent event. • Picking tickets, inventory count cards, remittance advice stubs attached to customer invoices, and payroll time cards are all examples of turnaround documents. • For example, we have seen picking tickets that are printed by the computer, used to pick the goods, and sent to shipping where the bar code on the picking ticket is scanned to trigger the recording of the shipment. 38 P-2: Calculate batch totals • Calculation of batch totals ensures that the data input arises from legitimate events (input validity) and that all events in the batch are captured (input completeness). • However, batch totals in isolation do not necessarily ensure input accuracy—that takes place in the reconciliation, which is discussed in P-4. 39 P-3: Record picking tickets • The picking tickets are automatically scanned into the computer using a bar code. • This process stores the accurate, valid input data onto digital media for subsequent updating in a timely manner with minimal use of resources. • The automatic calculation of the batch totals will ensure an efficient and effective subsequent reconciliation of the inputs. 40 P-4: Manually Reconcile Batch Totals • The manual reconciliation of batch totals control plan operates in the following manner: – a. First, one or more of the batch totals are established manually – b. As individual event descriptions are scanned, the data entry program accumulates independent batch totals. – c. The computer produces reports (or displays) with the relevant control totals that must be manually reconciled to the totals established prior to the particular process. – d. The person who reconciles the batch total must determine why the totals do not agree and make corrections as necessary to ensure the integrity of the input data 41 P-5: Record Shipments • Picking ticket data and accounts receivable master data are used to record shipments, which in turn updates the sales transaction data. • Automatic recording stores the accurate, valid input data onto digital media in a timely manner with minimal use of resources. 42 P-6: Reconcile input and output batch totals (agreement of run-to-run totals) • This is a variation of the agreement of batch totals controls. • With agreement of run-to-run totals, totals prepared before a computer process has begun are compared, manually or by the computer, to totals prepared at the completion of the computer process. • These post-process controls are often found on an error and summary report. • When totals agree, we have evidence that the input and the update took place correctly. • This control is especially useful when there are several intermediate steps between the beginning and the end of the process and we want to be assured of the integrity of each process. 43 P-7: Compare picking tickets (from a tickler file) and packing slips (one-for-one checking) • This has two purposes: 1. One is to ensure that all picking tickets are linked to an associated packing slip, 2. The other is to ensure that all items on related picking tickets and packing slips match. • We regularly review a tickler file, to clear items from that file. – Tickler files may be digitized reflecting events that need to be completed, such as open sales orders, open purchase orders, and so forth. – Should tickler file documents remain in the file too long, the person or computer monitoring will determine the nature and extent of the delay. • Picking tickets are compared to their associated packing slips using one-for-one checking to determine that they agree. – Differences may indicate errors in input or update. – This procedure provides us detail as to what is incorrect within a batch. – Being very expensive to perform, one-for-one checking should be reserved for low-volume, high-value events. 44 M-1: Automated Sequence Checks • Whenever documents are numbered sequentially, a sequence check can be automatically applied to those documents. • Batch sequence checks work best when we can control the input process and the serial numbers of the input data, such as payroll checks. – In a batch sequence check, the event data within a batch are checked as follows: • a. The range of serial numbers constituting the batch is entered. • b. Each individual, serially pre-numbered event data is entered. • c. The computer program sorts the event data into numerical order; checks the documents against the sequence number range; and reports missing, duplicate, and out-of-range event data. • Cumulative sequence check provides input control when the serial numbers are not entered in sequence (i.e., picking tickets might contain broken sets of numbers). – Matching of individual event data (picking ticket #s) is made to a file that contains all document numbers (all sales order numbers). • Periodically, reports of missing numbers are produced for manual follow-up. – Reconciling a checkbook is another example of a situation where the check numbers are issued in sequence. • However, the bank statement we receive may not contain a complete sequence of checks. • Our check register assists us in performing a cumulative sequence check to make sure that all checks are eventually cleared. 45 M-2: Computer Agreement of Batch Totals • This control plan does not exist in Figure 9.7 and therefore is shown as a missing plan. • The computer agreement of batch totals plan is pictured in Figure 9.9 and works in the following manner: – a. First, one or more of the batch totals are established manually (i.e., in the user department in Figure 9.9). – b. Then, the manually prepared total is entered into the computer and is written to the computer batch control totals data. – c. As individual event descriptions are entered, a computer program accumulates independent batch totals and compares these totals to the ones prepared manually and entered at the start of the processing. – d. The computer prepares a report, which usually contains details of each batch, together with an indication of whether the totals agreed or disagreed. – Batches that do not balance are normally rejected, and discrepancies are manually investigated and included in a summary report 46 Computer Agreement of Batch Total Control Plan 47 Control Matrix Data Entry with Batches 48 ...
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This note was uploaded on 02/14/2011 for the course AIM 6343 taught by Professor Jeffreyr.kromer, during the Spring '11 term at University of Texas at Dallas, Richardson.

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Revised09final - Controlling Information Systems Business...

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