Wrong but useful. Working @Twitter, tweeting about data science and people management.
"Wait, it's all her views?" 
"Always has been"
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Some recommended “which channel?” heuristics from our employee handbook
I realize these if statements aren’t perfectly MECE but I worry I’m too close in the problem to see it’s bugs. Any suggested improvements welcome 
pic.twitter.com/daG8mTn187
This seems like a pretty useful framework for picking email vs. slack! An intersecting (adjacent?) concern might be public vs. private conversations, which both email and slack can be.
One advantage of teams physically sitting together is the opportunity for osmosis just by overhearing others' conversations. Having other folks copied on emails or chatting in a public slack channel aren't perfect replications of that phenomenon, but they're better than nothing
To foster conversations in public, it might be useful to have some guidance along the lines of "get someone's attention with a DM, but move the discussion to a public channel if relevant"
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Fwiw I frame it more as an escalation path rather than a dont use x for
Someone may need to send an urgent email or slack to leverage other attributes of those platforms, but if they want immediate reply, I’m clear about call > text > slack > email as my escalation path