Objects of control

The objectives of control argon: To ensure that all in frame of referenceation be processed To preserve the integrity of maintained data To detect, constitute and re-process all misplays To bar and detect fraud Types of Controls The different controls give the sack be grouped under five headings: Manual controls data protection controls Validation counteracts Batch controls Other controls Types of Error ashes designers must guard against the following cases of error: Missing citation documents Source documents on which entries ar omitted, illegible or suspicious Transcription errors selective information conceptualisation errors Program faults Machine hardware faults Manual Checks Even in advanced systems checking of source documents is necessary. Checks may accept: Scrutiny to detect: Missing entries Illegible entries unlogical or unlikely entries Reference of the document to stored data to endue forward entries Re-calculating to check calculations made on the document Data exhibition Controls The collection of data for impact involves transcribing it into a form suitable for machine processing. There is a real hypothesis of error at this stage. Controls must be imposed to sustain or detect errors at this stage. The type of control depends on the method of data collection utilize: Data Collection Controls 2 On-line systems. These depend on the data displayed on a VDU or printed being checked by the actor before being processed.

Character recognition. With these techniques, accuracy depends on the denotation subscriber detecting any doubtful character or mark. Validation Checks 1 A figurer cant bill errors in data being proces sed in the homogeneous way that a human ope! rator can. Validation checks are an attempt to build into computer programs the ability to detect and circulate incorrect data items Checks can be made at two stages: Input - when data is entered Updating - after processing Validation Checks 2 The main types of validation check utilize are: Presence. Data are... If you want to get a bounteous essay, order it on our website: OrderEssay.net

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