Well it’s no secret that I like calc groups. But it’s also true that calc groups have an achiles heel. Calc Item names are constant, so for charts, legends stay the same no matter what. Depending on your use case you might get away with it, but sometimes you might get an end user that will not buy it — and he or she might be an important person, so it’s always good to have a Plan B. Field Parameters have brought fresh air, and indeed are great for such use cases because it’s not like you modify the DAX of the measure in the chart, you actually change the measure, so the name shown in the legend also changes, which is great. However, what happens if you want to create a chart where the user can pick from 4 KPI’s and say 8 time intel calculations?? First you’ll have to create the measures, then the field parameter, then figure out how to model that for the user to be able to select measure and calculation intependently… I mean it’s not impossible, but looks long and boring. Let’s see what we can do about it!