The targets chart in the TestProject reports gives you a summary of the number of tests that have passed or failed on different devices. Understanding how your tests perform on different devices is a crucial step towards understanding what the quality of your product is to all your clients. This chart gives you an at a glance summary of which devices might be having problems
The Targets chart can be found on the same page as the trends chart by clicking on the third navigation dot under the chart display
These charts are available as a high level summary of all tests run or to summarize each project that you have setup.