SSAS - Measures (dimension)
.1 - Group
Measures are grouped into measure groups based on their underlying fact tables. Measure groups are used to define the relationship between the dimensions and the measures. When a dimension or a measure group is added to the cube, SSAS will examine the relationship that exists between the fact table and the dimension table in the data source and automatically set the Measure Group information in the Dimension Usage tab of the Cube Designer.