Aggregation is referred to as the method of viewing numeric values or measures at greater and more resumed information rates. When a measure is placed on a shelf, Tableau adds the information automatically, normally by adding it in sum. The aggregation applied to a field can be determined easily, since the feature always appears on the shelf before the field name. Sales become, for instance, SUM(Sales).  You can only add measures for relational data sources using Tableau. Only aggregated data is contained in multidimensional data sources. Only Windows supports multidimensional information sources in Tableau. According to Tableau, the disaggregating of your information allow you, when evaluating steps that you may want to use separately and dependently in the perspective, to see every line of the information source that is helpful. For instance, you can analyze the results of a product satisfaction survey along a single axis with the age of participants. You can add the age to determine the median age of respondents or broken down information to determine the age of respondents with the item most satisfied.