3.1.3 Data Representation, Structure and Management

Question	Answer
Can you use Binary, Octal, Hexadecimal and BCD?	Yep
Add you add and subtract Binary and use Two's Complement?	Yep
Do you know what ASCII, EBCDIC and UNICODE is?	A character set is a table of Alphabetical (alpha) characters showing their numeric equivalent. (A= 65 in ASCII) One character requires one byte of memory Represents a total of 128 characters
What is Optical Mark Recognition?	Shaded boxes are used to provide information. The position of the shading is what’s important – think of a National Lottery ticket
What is Optical Character Reading?	Shapes of individual text characters are read and compared to standard shapes from the computer’s memory.
What is Magnetic Ink Character Recognition ?	Characters are printed in magnetic ink to allow them to be read by computers at a later date. Magnetic ink helps improve accuracy of reading – MICR can be found in passports.
What is Verification?	Verification means checking the input data with the original data to make sure that there have been no transcription errors.
What is Validation?	Validation is a check on DATA INPUT to the system by comparing the data input with a set of rules that the computer has been told the data must follow. Validation is carried out by the computer system itself, using rules about what type of data to expect.
What are the 7 Validation rules/checks?	Range Character Format Length Existence Presence Check Digit

Resource summary

	Created by Molly Hills almost 10 years ago