I was asked this question yesterday and I didn't know the answer. I'm a total ssrs noob so if you could explain it thoroughly that would be helpful. What is the difference between a click through and a drill through report in ssrs?
Clickthrough Reports
A clickthrough report is a report that displays related data from a report model when you click the interactive data contained within your model-based report. These reports are generated by the report server based on the information contained within the report model. The person who created the model determines which fields are interactive and which fields are returned when a clickthrough report is opened. These field settings cannot be changed in the report authoring tools.
Clickthrough reports are auto generated. However, you can create an alternative customized report to the model for interactive data items that is displayed instead. The custom report is a standard Reporting Services report.
Drillthrough Reports
Drillthrough reports are standard reports that are accessed through a hyperlink on a text box in the original report. Drillthrough reports work with a main report and are the target of a drillthrough action for a report item such as placeholder text or a chart. The main report displays summary information, for example in a matrix or chart. Actions defined in the matrix or chart provide drillthrough links to reports that display greater details based on the aggregate in the main report. Drillthrough reports can be filtered by parameters, but they do not have to be. Drillthrough reports differ from subreports in that the report does not display within the original report, but opens separately. They differ from clickthrough reports in that they are not auto generated from the data source, but are instead custom reports that are saved on the report server. They differ from drilldown reports in that they retrieve the report data only for the specified parameters or for the dataset query.