OLAP models are based on the idea that values in a data source can be categorized as either facts or dimensions of facts. Facts are the numeric, variable values in the database, such as numbers of units sold. Associated with facts are related data values that provide additional information, such as store locations. An OLAP model contains a fact table, dimension tables, and dimension branches. An OLAP model may contain time and accounts dimensions.
Integration Services creates an OLAP model that is a logical model, not a physical star schema, and is a logical representation of data values you select from data sources and report in Essbase.