I have one system, in the way that I follow up private projects and next actions in the exact same way I follow up work related projects. But I do have them on two dofferent lists. I do my follow up in an excel sheet, this only means I have a different tab for my private actions. Same system, different list.

You might call this a subsystem or a different system... I call it a different face/aspect of the same system. Looking around you, you will find a lot of that type of different faces your system can have. Yet it is still one system...
- Your dirty dishes lying in the kitchen sink = "these are for cleaning"
- a pile of bills to pay in a fixed location = "these are for paying"
- ...

I don't know if I'm clearly expressing myself, what I meant to say was: keep them totally integrated or on separated lists as you prefer, but make sure they follow the same philosophy and approach...

Myriam