If You Give a Clown a MetricCadence is the most important aspect of iterative software development. I am weary of misconceptions about velocity. I'm weary of re-treaded PMs turning velocity into a blunt instrument.
The Law of The Swift
Cadence is the vastly under-reported life-force behind iterative development.
So, two days into your second sprint, if your panic-strickened PM adds two new developers, then prods & pokes you about squeezing in another story or two, I advise you to diplomatically offer the reminder that
Half a Swift DOES NOT deliver twice the gas mileage.
This regressive misconception is formally known as Brook's Law. Brook's law says,"adding manpower to a late software project makes it later".
Brooks more famously quipped
Nine women can't make a baby in one monthIn the absence of distractive churn, seasoned developers need at least several iterations to establish a cadence. Forget the silly chart.
In honor of the 10th anniversary of the Agile Manifesto, developers who have, year after year, dragged dysfunctional balls & chains to the delivery finish line should not have to view another burn-down chart.
Adding a new developer mid-iteration is disruptive. Adding two new developers mid-iteration is, not surprisingly, also disruptive. Please don't knock us off the beat. Let us play a few bars into the tune before you pull the fire alarm.
All we ask as developers is that succinct stories with a bulleted list of testable assertions roll into our purview like so many chocolate kisses on a conveyor belt. Then, please step away from the conveyor belt so we can syncopate while gorging on chocolate kisses.