Writing a Post-Mortem After a Campaign Lands Like a Flop
Most teams skip the post-mortem because the results are embarrassing or the deadline for the next push is already breathing down their necks. I've seen it happen repeatedly. The campaign tanks, leadership wants answers, and someone inevitably says we should do a better job documenting this next time. Nobody does. A proper post-mortem isn't about blame assignment. It's about creating a paper trail that prevents the same mistake from costing money six months later. The Marketing Post Mortem Template I use is stripped down to the essentials. It has five sections and I keep the whole thing under two pages so people actually read it instead of treating it as busywork.
The Template Structure
Here's what goes in it. Keep it this simple and you'll get people to fill it out honestly. Section 1: Campaign Summary — Name, objective, budget, timeline, channels involved, target audience, and the primary KPI. One paragraph. No fluff. If you can't summarize what the campaign was supposed to achieve in three sentences, you didn't plan it clearly enough to begin with. Section 2: Results vs. Targets — A side-by-side comparison of what was promised and what actually happened. Include the numbers: impressions, clicks, conversions, CAC, LTV if relevant. Call out the gap percentage. This is the part most people drag their feet on because staring at bad numbers is uncomfortable. Do it anyway.
Section 3: What Went Well — Two to five bullet points. Specific tactics or decisions that moved the needle positively. Not generic praise like "the creative was strong." Something actionable like "retargeting the cart-abandonment segment at 48 hours produced a 22% conversion rate compared to the 8% baseline." That's the kind of detail that matters. Section 4: What Went Wrong — Same format. Every failure gets a root cause, not just a symptom. "Low CTR" is a symptom. "The headline tested at 2% CTR in pre-campaign surveys but we used a different variant in production because the creative lead was on vacation" is a root cause. Distinguish between the two. Section 5: Recommendations for Next Time — Concrete, numbered action items with an owner and a target date. This section is where most post-mortems die. I've seen documents end after Section 4 with a vague "we should communicate better next time." That's useless. Write "Assign a secondary approver for all creative variants by Q3 so single-point-of-failure delays don't slip through again." Specificity is the whole point.
Get the Full Details
How to Run the Actual Meeting
Don't schedule a one-hour meeting to fill this out. I do a 30-minute session two weeks after campaign close, and I send the template out five days before so everyone comes prepared with their notes. People who show up empty-handed become a bottleneck fast. Start with Section 2. Lead with the data. If the room goes quiet when you read the conversion rate, that's productive. Use that silence. Then move backward through the sections. Let the people who worked closest to the ground own Sections 3 and 4 first. Management tends to hijack these conversations if they start speaking first. I also make it a rule that no one defends their work during the meeting. You can state facts, provide context, offer alternative interpretations of the data, but defensive language gets flagged and the conversation moves on. The goal is accuracy, not vindication.
A Real Edge Case I Ran Into
Last year I ran a multi-channel launch for a SaaS product where the attribution model broke somewhere between Google Ads and our CRM. We credited 340% of the conversions back to paid search, which made the campaign look like a spectacular winner on paper while the actual pipeline revenue fell 12% short of target. The post-mortem almost became a exercise in defending good-looking but fake numbers. The workaround was straightforward. I pulled raw click-to-close data directly from Salesforce instead of relying on the marketing platform's attribution report. Cross-referenced it against the UTM strings we'd appended at launch. Found that the middle-of-funnel retargeting pixels were firing duplicate signals that inflated the last-click conversion count by roughly a factor of three. Once I had that discrepancy documented in Section 2 with the corrected numbers, the rest of the template fell into place naturally. The recommendation in Section 5 was simple: disable cross-domain pixel tracking until the attribution model supports it, and audit the setup before every major campaign going forward.
What This Template Misses
It doesn't capture qualitative feedback from the sales team unless you build in a step to collect it beforehand. I've lost count of the times a campaign looked fine on digital metrics but the phone team reported prospects were confused about pricing because the ad copy promised something the landing page didn't clarify. The template as written won't surface that on its own. Another blind spot is audience fatigue. If you ran the same creative across three channels for eight weeks, the post-mortem will show cumulative numbers but won't tell you that channel X hit diminishing returns after week three and you were essentially burning budget for the last five. You need a separate breakdown for that, or you'll repeat the mistake next quarter without knowing why. If your organization runs hyper-aggressive sprint-based campaigns with weekly rollouts, a two-week post-mortem window means you've already launched three more initiatives and the lessons from the first one have faded from memory. In that environment, a lighter after-action review done within 48 hours of campaign close captures more useful detail. The full template still works, but tighten the timeline and cut the meeting to 20 minutes.
Where to Get It
I've put the template in a Google Sheets file and a Notion database. Both track the five sections and include a built-in gap calculator for Section 2 that auto-highlights anything outside your target range in red. The Notion version also has a dropdown for channel type and a tag system so you can filter by campaign category later. If you want either one, it's available at the usual internal wiki link on our ops page. No paywall, no email capture, just a copy button. Use it once on a small campaign before rolling it out company-wide. You'll learn which fields your team actually fills out and which ones become decorative. Adjust accordingly. The version that works for your group will look different from this one after a few iterations, and that's the point.
