4 - IS Audit and Input Controls

4 IS Audit and Input Controls

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Unformatted text preview: pleteness • Verifying data converted to machine-readable form BUSI 335 Copyright © 2009-10 Y.M. Cheung, W. Tan, C. Woo and P. Bera Garbage In = Garbage Out 33 BUSI 335 Copyright © 2009-10 Y.M. Cheung, W. Tan, C. Woo and P. Bera 34 Error Checking Techniques When can Data be Checked? can Data be Checked? • Data can be checked for errors at: • Character • Field • Record • Group of records of records – Input time – Processing time • Processing is frequently designed under the assumption that the data are correct. • Checking data at input time ☺ Errors checked at source Input validation is complex to design in an interactive environment BUSI 335 Copyright © 2009-10 Y.M. Cheung, W. Tan, C. Woo and P. Bera 35 BUSI 335 Copyright © 2009-10 Y.M. Cheung, W. Tan, C. Woo and P. Bera 36 Field Level Field Level Character Level Character Level • Format Check: The technique Check: technique Does not depend on other fields within within a record or other records. examines the contents, size, and sign of individual data fields....
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This document was uploaded on 03/04/2014 for the course COMM 335 at The University of British Columbia.

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