The drilldown provides information across various categories in a given hierarchy. The drill through provides advanced details on a category from the context of the drilldown.
The drilldown lets you view more information about a particular element of a chart in a panel. You can select a different dimension to view the particular element. The different dimension lets you view more information contributing to the overall generic information
In the previous dashboard infrastructure you can only drilldown one level. Now you can easily define the panels that provide n-level drilldown in a given hierarchy. You can link one panel to the other as well.
For example, a summary panel may present the risk experienced by an organization due to all the Security Objectives defined by its CISO. The CISO can drilldown to the Risk Objective with highest risk and see the various categories contributing to the risk score of the Risk Objective. From there the CISO can drilldown further by clicking on the category that has the highest risk. This way the CISO can continue to drilldown in the controls hierarchy, from Risk Category > Controls Objective > Controls Statement > Checks or Vulnerability or Questionnaire or Extended tests. Similarly the CISO can choose to drilldown in the asset hierarchy instead of controls hierarchy. For example, show the risk at enterprise then at BU then at BU1 the sub-divisions of BU1, then at specific assets in that sub division.
A drill through lets you view the information in a grid at any point and at any level. The grid lets you view the advanced details that contribute in creating the chart on the top level.
For example, if you are currently at the Controls Objective level in the drilldown and you can drill through to a more detailed information page to view the details for the Control Objective that you clicked upon.