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Most delivery problems come back to the same 4 things: no rhythm the team keeps, no owner for each step, no definition of done, and a process that lives in people's heads.
Rhythms, Roles & Expectations is the system I use with clients to fix that. It covers the one-hour mapping exercise I run first, how to set a rhythm the team keeps, one owner per step, and a definition of done for everything you sell.
It's short, it's free, and it works without me.