The document explains the concept of a data dictionary, which is essential for understanding and defining data within a system, similar to how a language dictionary helps with words. It details the composition of data elements, both primitive and composite, and emphasizes the importance of shared definitions for improved user experience and organizational re-use. An example is provided showing the structuring of data elements like telephone numbers and invoices.

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What is
DATA DICTIONARY

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3. Our Publications
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DATA DICTIONARY
BABOK v3 Technique 10.12
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5. What is a Dictionary?5
A dictionary helps in understanding the meaning of words,
idioms and phrases to be able to use them to write/work in
that language.
Dictionary is NOT a reference for language grammar

6. What is a Data Dictionary?6
A data dictionary helps in understanding the meaning of
data in a system to be developed. It’s details about data
and is also referred to as Meta Data

7. Data Dictionary
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Data Elements – Primitive and Composite
Data Dictionary composition
Attributes – Name, aliases, values, description

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Data Element
NAME
MOBILE NO
DATE OF BIRTH

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Data Element
NAME
Represented differently
DATE OF BIRTH
Represented differently

10. Data Dictionary
▪ Data dictionary is used to create a common shared understanding of
data in a system
▪ This common definition helps in improved user experience
▪ This also helps in re-use across the organization
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Data Element
COMPOSITE
COMPOSITE
PRIMITIVE
Name = First + Last
Birthday = Month + Day + Year

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Data Dictionary Example
Basic Element
Name
Any other name Type of values Description
ISD Code Country Code Number The international dialling code for the
country
STD Code City Code Number The country’s city code
Area Code Area Code Number Local telephone exchange number
Number Telephone Number Number Actual phone number
Telephone Number
=
ISD Code + STD Code + Area Code + Number

13. Composite Data Elements
Telephone Number = ISD Code + STD Code + Area Code + Number
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Sequences
Invoice = Invoice_number + Date + {items-ordered} + Sub-total + Tax + Total due
Repetitions
Customer_name = First_name + (Middle_name) + Last_name Optional

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