Field notes on contract-level ARR, renewals, and board reporting — method and working theory from building HarborOS.
ARR Bridge, ARR Waterfall, ARR Rollforward — the terms get used interchangeably, sometimes correctly, sometimes not. What each one actually means, and why the real problem was never the terminology.
Jim ArkinFounder, HarborOSHow finance teams set a budgeted renewal assumption, why it diverges from actual renewals mid-year, and what the gap is really telling you.
Jim ArkinFounder, HarborOSStarting ARR plus new, expansion, contraction, and churn equals ending ARR. The math is trivial. Trusting the result is not — here's why, and what the waterfall is really testing.
Jim ArkinFounder, HarborOSNet Revenue Retention: The One Number That Hides the Most
NRR is the headline retention metric every board fixates on — and the one most likely to paper over a churn problem. What it conflates, and how to read it honestly.
HarborOS does not run a content calendar. These are field reports on the methods behind contract-level ARR, renewals, and board reporting — the reasoning we use when we build the product.
Written by Jim Arkin, founder of HarborOS, and read by the operators who close the books and prepare for the board.
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