You may be familiar with the RACI Framework. We call it "ARCI" for reasons described in this post.
ARCI works so well that I'm building it into my Slack workflow. I created custom emojis for each item as I describe here in a post to the Storytell crew:
Here's an example where I'm "Informing" Maria while tasking Angela as "Responsible" in a Slack message:
@DROdio This is just awesome! I am familiar with RACI and this is the first time I have seen it reformatted as ARCI, which makes more sense. I also love the fact that it is now incorporated in Slack.