The use of a Represented Variable within a Data Set. It may include information about the source of the data.
The Instance Variable is used to describe actual instances of data that have been collected. Here are 3 examples:
1) Gender: Dan Gillman has gender <m, male>, Arofan Gregory has gender<m, male>, etc.
2) Number of employees: Microsoft has 90,000 employees; IBM has 433,000 employees, etc.
3) Endowment: Johns Hopkins has endowment of <3, $1,000,000 and above>,
Yale has endowment of <3, $1,000,000 and above>, etc.