Dimensions are a concise, intuitive way of organizing data. Each dimension is an attribute containing members, representing variations of the data. For example, the Region dimension might include the members North, South, East and West.
A dimension member is a part of a dimension—a dimension within a dimension. For example:
January 2005 or 1Qtr05 are members of the dimension Time.
Wholesale and Retail are members of the dimension Distribution Channel.
Base, Optimistic, and Pessimistic are members the dimension Scenario.
Account instances are unique intersections of dimension members within accounts where values are stored. For example, Sales of Radios/Retail Stores, or Sales of Clothes/Retail Stores might be instances of the account Sales.