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31 Cards in this Set
- Front
- Back
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Data |
Raw, unprocessed facts |
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Information |
Meaningful knowledge derived from raw data |
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Sources of data |
The thing that has been measured The person or organization that provided the data from observation |
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Source document |
Document that contains data for input into an information processing system |
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Types of data |
Text, images, animation sequences, audio, graphic objects, video |
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A document |
Something used to store and share data |
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Human-readable document |
A document that may be read by a human but not in a format that a computer can accept |
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Machine-readable document |
A document that can be read directly and understood by computer systems |
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Examples of human-readable documents |
Handwritten list |
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Examples of machine readable |
Barcode |
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Turnaround document |
A printed document that has been output from a computer systeem |
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Verification |
A process by which data that has already been input is checked to ensure that it matches data on the source document |
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Typographical error |
A typing error that affects the text, such as missing or additional characters |
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Transposition error |
an error caused by switching the position of two adjacent characters in a text string |
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Validation |
a checking process aimed at finding out whether the data is genuine |
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Types of validation |
range check, reasonableness check, data type check, consistency check, presence check, format check, length check |
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Methods of verification |
Double entry and proofreading |
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Double entry |
When the data is entered twice by two different clerks and the entries are compared to see if they are identical |
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Proofreading |
a manual method of verification in which the data clerk visually check the source document against data. |
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range check |
the data falls within the expected range. eg test score must be within 0-100 |
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reasonableness check |
the input conforms to specific criteria. eg |
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data type check |
the data entered is the correct type for that field. eg a phone number should be numbers |
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consistency check |
the data does not contradict other data in the set. |
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presence check |
data has been entered in the field |
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format check |
data supplied in correct format |
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length check |
data isnt too short or too long |
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File access methods |
serial, sequentia, random and direct |
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serial |
to start at the beginning and read to the end in one go |
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sequential access |
required material to be ordered some way |
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random and direct |
allows user to jump straight to the required chapter |
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What type of file access method is used by files on a hard disk drive? |
direct |
