A forecast you can defend: commit, best-case, and the number in between
1. Before you start
A sales forecast is a number you promise: how much you will close in a period. Sales teams sort open deals into three buckets. Commit is what you are confident will close — you would stake your credibility on it. Best-case is the upside: deals that could close if things break your way. Pipeline is everything else, including early conversations that may go nowhere this quarter. Tiny example: you have one deal you are sure of ($10k) and one that might land ($10k with a 4-in-10 track record). Your commit is $10k; a defensible forecast counts the second deal at $10k × 0.4 = $4k, so you forecast $14k — not $10k, and not the wishful $20k.
Three honest statements before you start:
- This is a Decide course. You read a situation, learn the idea, and make a call. You do not write or run any code.
- The companies below, Meridian Freightways and Northwind Drayage, are composite — invented logistics firms built from ordinary figures so the arithmetic is clean. No number is a claim about any real company.
- This is not a certification. It proves, to you, that you can defend a sales forecast.
You need only arithmetic. The hard part is judgment, not maths.
2. The Situation
Meridian Freightways, a regional third-party logistics (3PL) provider, closes its quarter in three weeks, and the VP of Sales wants one number from you: what will your territory book? The rep on the deals wants to call it $1,000,000 — “add up the deals in play and that’s the number.” The finance partner wants only the $400,000 of signed-and-verbal deals — “anything else is a guess.”
One of those numbers gets you fired for missing it; the other gets you ignored for lowballing. The number you should give sits between them, and building it is the whole job.
3. What you’ll be able to do
After this course you will be able to:
- Sort open deals into commit, best-case, and pipeline, and say what separates them.
- Build a defensible forecast — commit plus a risk-adjusted slice of best-case — and name the one input that flips it from making the number to missing it.
- Spot happy-ears (counting upside at full value) and sandbagging (reporting only commit), and say what each one costs you the next quarter.
- Tell leadership one honest number and the gap around it, instead of a number you cannot stand behind.
4. Prerequisites & time box
Prerequisites: arithmetic and the idea of a percentage. Helpful but not required: having seen a sales pipeline or CRM deal stages before (explained in section 6). No spreadsheet, no sales background. This is the Decide hall — read and decide in your browser; there is no setup.
Time box: about 17 minutes of reading (measured), plus your own thinking time on the call. That is under the 25-minute cap for a concept course.
Difficulty: 3 / 8 — a new-manager decision: a couple of interacting factors and one real judgment call, where the obvious answer is often the trap.
5. The case & where the numbers come from
Meridian Freightways is a composite 3PL: its deal values and win rates are built from ordinary figures a regional freight sales team would recognise, chosen for clean arithmetic and not drawn from or claimed about any real firm. The definitions — sales pipeline, forecast categories, win rate, expected value — are standard and cited in section 11. Every dollar and every percentage below is an in-course assumption; every later number is computed from these.
| Item | Figure |
|---|---|
| Commit deals (signed or verbal yes) | $400,000 |
| Best-case deals (live proposals / negotiation) | $600,000 |
| Pipeline deals (early discovery this quarter) | $1,500,000 |
| Historical win rate on best-case deals | 40% |
| Historical win rate on early-pipeline deals | ~10% |
| The number leadership expects (quota) | $650,000 |
6. The Concepts
The three forecast categories
Every open deal sits in one of three buckets, and the bucket is a statement about confidence, not deal size:
- Commit — deals you are confident close this period: a signed order, or a verbal yes with only paperwork left. Meridian’s commit is $400,000. You would stake your credibility on it.
- Best-case — the upside: live proposals and active negotiations that could close if things break your way, but often slip or die. Meridian’s best-case is $600,000.
- Pipeline — everything earlier: discovery calls, unqualified interest. Meridian’s early pipeline is $1,500,000. Most of it will not close this quarter.
The mistake both voices in the situation make is treating a bucket as a dollar total. The rep adds up the deals in play — commit plus best-case, $400,000 + $600,000 = $1,000,000 — and calls that the forecast; fold in the $1,500,000 of early pipeline and the whole funnel is $400,000 + $600,000 + $1,500,000 = $2,500,000. The finance partner counts only commit ($400,000). Neither the $1,000,000, the $2,500,000, nor the $400,000 is the forecast, because none of them prices the upside for how likely it actually is.
Reading the win rate
A win rate is the share of deals in a bucket that historically closed. If, over the last year, best-case deals at Meridian closed 40% of the time, then a live $600,000 of best-case is not worth $600,000 and it is not worth $0 — its expected value is 0.40 × $600,000 = $240,000. That is the honest weight to put on the upside: not the headline, not zero, but the headline times the rate at which deals like it actually land.
The win rate is measured from your own closed history, not guessed. Early-pipeline deals here close about 10% of the time and are three weeks from the quarter’s end, so for this quarter’s forecast they weigh almost nothing — that is why pipeline sits out of the number below, even though it matters enormously for next quarter.
Building a number you can defend
A defensible forecast is commit at full value, plus best-case weighted by its win rate:
- Commit: $400,000 — counted in full; it is your floor.
- Best-case, risk-adjusted: 0.40 × $600,000 = $240,000.
- Defensible forecast: $400,000 + $240,000 = $640,000.
Leadership expects $650,000. So your honest call is: commit to $640,000, and flag that you are $10,000 short of the number — with the single deal or the single win-rate point that would close the gap. That is a forecast you can stand behind in the room: a floor you will hit, plus a priced view of the upside, plus the size and shape of the gap.
(An interactive calculator sits here — enter your own commit, best-case, and pipeline values and the best-case win rate, and it returns the defensible forecast, the gap to the number, and whether you make it. Watch the call flip as you move a deal from best-case into commit, or as the win rate changes.)
Why sandbagging and happy-ears both cost you
Two ways to get the forecast wrong, and both burn the thing a forecast is for — trust:
- Happy-ears counts best-case at full value: $400,000 + $600,000 = $1,000,000, or worse, the whole funnel. You look like a hero in the meeting and then close $640,000. Leadership staffed, spent, and promised the board against a number that was never real, and next quarter they discount everything you say.
- Sandbagging reports only commit ($400,000), hiding real upside so you can “beat” a soft number. It feels safe, but you starve your own territory of headcount and investment, you look like a weak forecaster, and when the best-case deals land anyway the beat looks engineered.
The defensible number — commit plus risk-adjusted best-case — is the one you can repeat next quarter without flinching. Credibility is built by being roughly right on purpose, again and again, not by being spectacularly right once.
7. Your Call
You have seen how commit, win rate, and the defensible number decide Meridian’s call. Now a different one lands on your desk.
Northwind Drayage hauls containers between a port and inland yards — a different logistics company from Meridian’s 3PL. Closing Q2, its rep has $250,000 in commit and $500,000 in best-case, and Northwind’s best-case deals have historically closed 30% of the time. Leadership expects $420,000. There is a wrinkle: $200,000 of that best-case is a single deal that has already slipped once from Q1, run by one champion who has gone quiet. The VP does not want a range — she wants the one committed number for the board deck, and a decision on whether that slipped deal belongs in the forecast at all.
How this differs from the taught case (the transfer): this is a different company in a different corner of logistics, the figures are different so the arithmetic must be redone, it asks a different decision — pick one board number and rule on one deal, not “do we make it” — and it adds a constraint the taught case never had: a specific deal that already slipped and is now single-threaded. The core concept is the same: a defensible forecast is commit plus a risk-adjusted slice of best-case, with each deal in the bucket its evidence supports.
8. Self-check
Before you write the memo, make sure you can say each of these in one line:
- What is the difference between the commit bucket and the best-case bucket — and why is it about confidence, not deal size?
- How do you turn a pile of best-case deals into a single defensible number?
- What does happy-ears cost you next quarter, and what does sandbagging cost you?
If any is fuzzy, reread section 6 — the three categories, the win rate, the defensible number, and the two failure modes are the whole course.
9. Stretch
Push the decision further on your own:
- Back at Meridian: which single move closes the $10,000 gap more cheaply — nudging the best-case win rate from 40% to 42%, or moving one $30,000 deal from best-case into commit? Work out what each does to the number, and which you could actually justify.
- Your best-case win rate has quietly drifted from 40% to 25% over three quarters while you kept forecasting at 40%. What has that done to your forecasts, and what is the first thing you fix?
- The genuinely hard one: two reps hand you forecasts. One always beats by 5%; the other is right on the nose half the time and misses badly the other half. Both “hit their number” on average. Which rep do you trust with a bigger territory, and what does that say about what a forecast is actually for?
10. Ship it — your decision memo
Write a one-page memo to Northwind’s VP of Sales. State the call (commit $340,000 for the board deck; do not forecast to the $420,000 expectation). Show the two-line arithmetic (commit $250,000 + risk-adjusted best-case 0.30 × $300,000 = $90,000). Name what you rejected and why (the $750,000 happy-ears funnel; the $250,000 commit-only sandbag; leaving the slipped deal in best-case) and name the $80,000 gap and the one thing that would close it (the slipped deal re-engaging with a real champion). Keep it to a single page a VP grasps in two minutes. This memo is your own argued claim — not a credential.
11. Sources
Meridian Freightways and Northwind Drayage, and every dollar figure and win rate attached to them, are composite and illustrative — constructed for clean teaching arithmetic, not drawn from or claimed about any real company. The concept definitions used to reason about them are standard; references below.
| Concept / claim | Source (publisher) | URL | Accessed |
|---|---|---|---|
| Sales pipeline and deal stages | Wikipedia — Sales pipeline | https://en.wikipedia.org/wiki/Sales_pipeline | 2026-07-20 |
| Forecasting as a prediction of a future quantity | Wikipedia — Forecasting | https://en.wikipedia.org/wiki/Forecasting | 2026-07-20 |
| Expected value = value × probability | Wikipedia — Expected value | https://en.wikipedia.org/wiki/Expected_value | 2026-07-20 |
| Sandbagging (deliberately understating) | Wikipedia — Sandbagging | https://en.wikipedia.org/wiki/Sandbagging | 2026-07-20 |
| Third-party logistics (3PL) context | Wikipedia — Third-party logistics | https://en.wikipedia.org/wiki/Third-party_logistics | 2026-07-20 |
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