Consistency

The absence of difference, when comparing two or more representations of an object against a definition.
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Do not confuse consistency with accuracy or correctness.
Consistency can refer to ensuring that data values are consistently represented within a dataset and between datasets, and consistently associated across datasets Or the degree to which data values of two sets of attributes within a record comply with a rule. Or the degree to which the data values of a set of attributes of a dataset at different points in time comply with a rule.
In consistency two or more data values are compared.
There are various types of consistency: 
Consistency within a record: The degree to which data values of two sets of attributes within a record comply with a rule 
Consistency between records within a dataset: The degree to which data values of two sets of attributes between records comply with a rule 
Consistency across datasets: The degree to which data values of two sets of attributes between datasets comply with a rule 
Consistency over time (temporal consistency ): The degree to which the data values of a set of attributes of a dataset at different points in time comply with a rule. 
Consistency across metadata: Is all the metadata consistent, or does it conflict with other metadata? For example, does a usage business rule demand that data be used when the creation business rules state it hasn’t been created yet? Plausibility of data values can be seen of a type of consistency. 
A rule can be an equation with a =, > or < symbol.  For example, profit = return – costs. 
A rule can also be a business rule. For example, one might expect that the number of transactions each day does not exceed 105% of the running average number of transactions for the previous 30 days. 
Reference Data item measured against itself or its counterpart in another dataset or database.
Measure: Analysis of pattern, semantic relatedness, and/or value frequency.
Unit of Measure: Percentage.
Example(s): School admin: a student’s date of birth has the same value and format in the school register as that stored within the Student database.

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