The Calculate Composite Index tool and its output charts are great, with the real value being the way the chart and the map can both be responsive for greater understanding and exploration. However, the Relationship of scaled variables and index chart is only responsive one way (i.e. clicking on a feature in the map will highlight it throughout the chart), rather than both. Still really good, and manually recreating any of the scatterplots will allow for that dual functionality, but it'd be awesome to click on an outlier dot on the Relationships chart and find it on the map without taking the extra steps.
