Every partnership leader says some version of the same sentence in the quarterly review: “partner-sourced deals close faster.” Heads nod. Nobody asks the follow-up, because nobody can answer it: how much faster, measured how, compared to what?
That gap has a name in our world: Customer Discovery Efficiency, or CDE. It’s the first of three ecosystem metrics we build Entwine around, and it’s the simplest to explain, which is exactly why it’s the right place to start this series.
The question CDE answers
A customer with a problem takes one of two roads to your solution. The direct road: they find you, you qualify them, you run your process. The ecosystem road: a partner who already has their trust says “talk to these people, this is your problem’s shape.”
CDE measures the difference between those roads. Not anecdotally — arithmetically:
CDE = average days-to-close for direct deals ÷ average days-to-close for ecosystem-sourced deals
Closed-won deals only, on both sides. A CDE of 1.0 means your ecosystem road is no faster than the direct one. A CDE of 2.0 means a customer who arrives through your ecosystem gets from need to signed solution in half the time.
Three things about that formula matter more than the formula itself:
1. It only counts what happened. CDE is computed from your actual opportunity records, including created dates, close dates, and who referred whom. No sentiment weighting, no “estimated influence,” no model deciding a partner probably helped. If the score is empty, it’s because the data is, and that emptiness is information too.
2. “Ecosystem” is wider than “partner.” The deals on the ecosystem side of the ratio are segmented by referrer type - partner-referred, customer-referred, and other-referred - against purely direct deals. Your happiest customer is part of your ecosystem’s discovery engine whether or not anyone gave them a partner tier. Most measurement frameworks miss this entirely; the referral your customer made last quarter is doing the same work your partners do.
3. Averages lie, so keep the median in view. One whale deal that closed in a week can flatter an average. We compute the median days-to-close alongside the average for both roads, so a single outlier can’t manufacture an efficiency story. If your average says 2.1× and your median says 1.2×, you don’t have an efficient ecosystem, you have one great story and a measurement habit to fix.
Why speed, of all things?
Because discovery speed is the one benefit of an ecosystem that shows up before revenue attribution fights start. Sourced-revenue percentages descend into arguments about who touched what. Days-to-close is harder to argue with: the deal either spent 90 days in your pipeline or it didn’t.
And it compounds quietly. If ecosystem-sourced deals close in 60 days against 100 direct, that’s not just 40 days of sales cost saved, it’s a customer who spent 40 fewer days with an unsolved problem. That’s where partnership measurement usually stops and customer-success measurement should begin, the “partnership paradox” we’ll take apart properly in the next piece.
What to do with your number
No number at all? Your opportunities aren’t recording a referral source. Fix the habit before the metric; a quarter of honest data beats a year of backfilled guesses.
CDE ≈ 1.0 means your ecosystem isn’t accelerating discovery-to-close. That’s not a verdict on whether partners create net-new demand, only a second lens (volume, win rate, source uniqueness) can tell you that. It’s a signal to look closer, not a conclusion.
CDE comfortably above 1: you’ve earned the next question, which is whether those faster-won customers also succeed faster and stay longer. Speed of discovery is the door; lifecycle contribution is the house. That’s the second metric - the Customer Success Index - and it’s next week’s letter.
You can compute CDE for your own book with a spreadsheet, two columns of dates and a referrer tag, and honestly, you should, this week. If you’d rather have it computed continuously - per partner, medians and all, on a live dashboard - that’s what we built Entwine for. The free workspace monitors five relationships, no credit card: entwineapp.io.
This is part 1 of a series on the three ecosystem metrics — CDE, CSI (Customer Success Index) and ECS (Ecosystem Completeness Score) — and the four depths of partnership they measure.