When the user wants to figure out which marketing actually drives conversions and revenue, choose or interpret an attribution model, or reconcile conflicting numbers across tools. Also use when the user mentions "attribution," "attribution model," "first-touch vs last-touch," "multi-touch," "which c

Attribution You help users answer the hardest question in marketing: which of my efforts actually caused this conversion and this revenue? Attribution is where marketers lose the most money — to channels that look good in one dashboard and terrible in another, to "direct" and "branded search" that hide the real source, and to models that quietly encode an opinion as if it were fact. This skill has two pillars. Know which one the user needs before you dive in: (A) Interpretation — choosing an attribution model, picking a measurement approach, and reconciling the conflicting numbers your tools report. This applies to everyone, even with zero engineering. (B) Own your attribution (first party) — instrumenting and stitching attribution yourself when you control the site/app. This is the build track. Use it when the user says "I want to track this myself" or is hitting a conversion that lives on a domain they don't own. Most requests start with (A). Reach for (B) only when they control the surface and want to build. Product context: check for .agents/product marketing.md and read it if present — business type, sales cycle, and primary conversion drive almost every recommendation here. Boundaries — what this skill does NOT own State these up front so you don't rebuild neighboring skills: General event tracking, tracking plans, UTM setup, GA4/GTM → analytics . Attribution assumes tracking exists . The line: analytics = "what events and how to fire them"; attribution = "how touches join to conversions and survive to revenue." Ad platform pixels, CAPI, server side conversion tracking → ads ( references/conversion tracking.md ). Attribution consumes platform reported numbers and corrects for their bias; it doesn't set up the pixels. Pipeline stages, lead lifecycle, CRM revenue dashboards → revops . Attribution feeds pipeline data; it doesn't define stages. Showing up in / measuring AI search → ai seo . Attribution names AI traffic as a blind spot only. Pillar A — Interpretation 1. What attribution can and can't tell you Set expectations before touching a number: Attribution is directional, not truth. It's a model of causality built from incomplete data (cookies expire, sessions fragment, offline touches vanish, people research on one device and buy on another). Treat it as a strong hint, never a verdict. Every model is an opinion. "First touch" says the first ad gets all the credit; "last touch" says the closing click does. Both are wrong in opposite directions. Choosing a model is choosing whose story to believe — say so out loud. The attribution gap is normal. The sum of channel reported conversions almost always exceeds real conversions, because every platform claims credit for the same sale. Your job is to shrink and explain the gap, not to make the numbers tie out perfectly. They won't. When a user demands one true number, reframe: "We can get you a defensible, consistent number and a read on which channels are trending up. A single objective truth doesn't exist — here's why, and here's what we use to make decisions anyway." 2. Attribution models The six standard models and when each one lies: Model Credit rule Best for How it lies First touch 100% to the first known touch Top of funnel / demand gen valuation; short cycles Ignores everything that closed the deal; over credits awareness channels Last touch 100% to the last touch before conversion Direct response, quick e comm Over credits bottom funnel + branded search/direct; ignores what created demand Last non direct 100% to last touch, skipping "direct" A cheap fix for direct pollution Still single touch; just moves the blind spot Linear Equal credit to every touch Long, multi touch journeys where every step matters Treats a throwaway visit like a demo; flatters high frequency channels Time decay More credit to touches nearer conversion Longer cycles where recency matters Under credits the top of funnel; still an assumption, not a measurement Position based (U shaped) 40% first, 40% last, 20% middle B2B with clear "created" + "closed" moments The 40/40/20 split is arbitrary; middle touches get shortchanged Data driven (algorithmic/Shapley) Credit from modeled marginal contribution High volume accounts with enough conversions A black box; needs volume; can't see offline/dark touches it was never fed Rules of thumb: Never report a single model in isolation for a long sales cycle. Show first touch and last touch side by side — the truth lives between them, and the gap between them is the insight. Data driven attribution needs volume (Google Ads historically gated it behind ~3,000 ad interactions and ~300 conversions in 30 days; it has since relaxed the minimums and made DDA the default, but low volume still makes it noise dressed as science). Use position based instead when you're thin. The model matters far less than being consistent and pairing it with an out of model sanity check (Pillar A §4, self reported). For the model math, worked examples of one journey scored six ways, and Shapley explained plainly, see references/attribution models.md . 3. The three measurement paradigms Models split credit within your tracked data. Paradigms are how you get at causality — increasingly rigorous, increasingly expensive: Paradigm What it is Answers Needs Watch out MTA (multi touch attribution) Stitch user level touches, apply a model "Which touchpoints appear on converting journeys?" Clean cross device user level tracking Cookie loss + privacy have gutted user level data; it silently under measures MMM (media/marketing mix modeling) Top down regression of spend vs. outcomes over time "What's each channel's aggregate contribution, including offline/brand?" 2–3 yrs of weekly data, spend variation Correlational; slow to react; needs real budget swings to learn Incrementality (geo holdout, PSA, ghost ads, on/off) Controlled experiment: exposed vs. withheld "Did this channel cause lift I wouldn't have gotten anyway?" Ability to withhold; enough volume for significance The gold standard, but you can only test a few things at a time How to choose: small budget / short cycle → good UTM + last non direct + a self reported survey beats a fancy model. Mid budget, several channels → MTA for day to day + periodic incrementality tests on your biggest line items. Large budget, offline + brand spend → MMM for the portfolio + incrementality to validate MMM's coefficients. Incrementality is the tiebreaker whenever two channels both claim the same conversions. Decision table by budget × sales cycle × channel count, and how to read a geo holdout / PSA test (not a stats tutorial), in references/measurement paradigms.md . 4. Self reported attribution The most underused signal, and often the most honest for long cycles and dark social. A post conversion "How did you hear about us?" survey catches what tracking structurally cannot: podcasts, word of mouth, Slack communities, a founder's tweet, "a friend told me." When it beats tracking: long consideration cycles, high word of mouth, brand/community led, or heavy dark social (see §5). If a big slice of your journeys are "direct," you have a self reported shaped hole. Ask at the moment of conversion (signup, first purchase, demo request) — highest recall, before memory fades. Wording: open ended ("How did you first hear about us?") captures dark social; a short pick list is easier to quantify but pre biases the answer. Best practice: pick list of your known channels plus a free text "other/tell us more." Treat it as a triangulation input, not gospel — recall is fuzzy and people credit the memorable touch, not the first. It's the out of model check that keeps your tracked models honest. On the build side, this is a form field written to your CRM/analytics as a person property — see Pillar B and references/first party tracking.md . 5. Reconciling conflicting sources The request behind most attribution work: "Google says 50, Meta says 40, GA says 60, my CRM says 35 — who's right?" Nobody is. Here's the framework. Why each source systematically lies: Source Biased toward Because Ad platforms (Google/Meta/LinkedIn) Over counts itself Claims view through + click conversions in its own window; every platform counts the same sale; motivated to look good GA / web analytics Last non direct click Loses cross device, loses cookie blocked users, dumps the unknown into direct CRM Whatever the rep typed / the form captured Human entry, lead source overwrites, offline deals with no digital trail Self reported survey The memorable touch Recall bias; under counts boring but real touches like retargeting How to triangulate: 1. Pick one source of truth for the conversion count — usually your CRM or backend (the system where money is real). Everything else explains where those came from , they don't get to redefine how many . 2. Never sum across platforms. If Google and Meta both claim a conversion, you have one conversion with two claimants, not two conversions. De dupe against the source of truth total. 3. Read directional agreement, not absolute match. If every source says paid search is up and organic is down this quarter, that trend is trustworthy even though no two numbers match. 4. Use self reported as the tiebreaker when platforms fight over the same conversions, and incrementality when the stakes justify a test. 5. Expect and budget for the gap. Report "platforms claim N; we can verify M; the delta is over claiming + view through + untracked — here's our best allocation." The output is an honest allocation with confidence levels, not a false reconciliation to the decimal. 6. The blind spots Where conversions hide, making real channels look weak: Direct — the junk drawer. Bookmarks and typed URLs, yes, but also stripped referrers, app to web, dark social, and any touch your tracking dropped. A large direct share is a measurement problem, not a channel. Branded search — people who discovered you elsewhere and Googled your name. Last touch hands the credit to paid/organic branded search; the real driver was whatever made them search. Segment branded vs. non branded or you'll defund the top of funnel. Dark social — sharing that carries no referrer: DMs, Slack/Discord, podcasts, newsletters, screenshots. Structurally invisible to tracking; self reported is the only way to see it (§4). AI traffic — assistants and AI search increasingly influence buyers, then send them via branded search or direct, so the AI touch is invisible in analytics. Name it and hand deeper work to ai seo . The through line: when "direct" and "branded search" dominate, your top of funnel is working and your attribution is hiding it. Say that explicitly — it's the single most common misread in marketing. 7. Business type fork Defaults differ sharply. Summary here; full playbooks in references/by business type.md . B2B SaaS (long cycle, sales assisted): journeys span weeks–months and multiple people, so single touch models mislead badly. Anchor on the CRM as source of truth , use first touch + position based side by side, lean hard on self reported at demo/signup , and treat pipeline/revenue attribution (→ revops) as the real scoreboard. Offline touches (events, sales convos) make MTA weakest and self reported strongest here. Ecommerce / DTC (short cycle, self serve): fast journeys, high volume, spend concentrated in paid social + search. Anchor on platform ROAS but distrust it (iOS/CAPI inflation), validate with MMM once spend is material and incrementality/geo holdouts on your biggest channels, and use a post purchase survey