Central Thesis
Between 20% and 70% of new customers are lost in their first 100 days, not because of the product, but because of neglected attention during the post-sale experience. Most companies pour their entire focus into acquiring the customer and almost none into retaining them during the period they're most vulnerable: the first 100 days of the relationship.
The fix: design deliberate touchpoints across each of the eight phases of the customer lifecycle, using the six available communication channels, to turn new buyers into lifelong customers and eventually into active promoters.
The First 100 Days Framework
Coleman maps the customer lifecycle into eight phases, each with its own emotional state. The exact timing of each phase varies by industry and business model, every company has to map when its own customers move through each one.
| # | Phase | Timing | Customer's emotional state |
|---|---|---|---|
| 0 | Assess | Before the purchase | Evaluating whether to buy; researching options |
| 1 | Admit | Day 1, the purchase | Euphoria, dopamine, hope and possibility |
| 2 | Affirm | Hours to days post-purchase | Buyer's remorse; rising doubt and anxiety |
| 3 | Activate | First use or delivery | First real physical and emotional impression of the product |
| 4 | Acclimate | Learning the system | Learning; forming, or not, new habits |
| 5 | Accomplish | First result achieved | Satisfaction at reaching the original goal |
| 6 | Adopt | Full integration | Habit formed; consistent results; brand partner |
| 7 | Advocate | Past day 100 | Ready to refer, testify, and evangelize |
The 6 Communication Channels
For each phase, Coleman recommends using as many of these six channels as possible, ideally at least one per phase, ideally all of them over time.
| Channel | How it's used |
|---|---|
| In Person | Demos, celebrations, meetings, direct human connection |
| Video | Personalized team videos, "welcome to our family," video testimonials |
| Personalized and signed, educational sequences, surveys, congratulatory messages | |
| Mail (physical) | Handwritten notes, unexpected gifts, artifacts of the relationship |
| Present | Surprise gifts, samples, unexpected bonuses, never branded merch |
| Phone | Personal thank-you calls, calls from senior leadership, high-energy voicemails |
The 8 Phases in Detail
0Assess (Pre-purchase)
The prospect is deciding whether to buy, a process that can last seconds or months depending on the product. The opportunity is aligning expectations with reality before the sale, preventing future disappointment. Tactics: live demos, educational newsletters, free samples, "ask the expert" sessions with customer success (not sales), and short videos that put a human face on the brand before purchase.
1Admit (Day 1: the purchase)
The moment of highest emotional openness, dopamine, hope, and possibility. The opportunity is capitalizing on that euphoria and exceeding expectations from the first instant. Tactics: a genuine, energetic in-person celebration; a surprise gift that reflects the customer's value (never branded merch); a personalized email signed by the whole team; a handwritten thank-you note sent the same day; a personal thank-you call within 24 hours; and a short "welcome to our family" video.
2Affirm (Hours to weeks post-purchase)
The dopamine fades and doubt creeps in. The "quiet zone" between purchase and delivery amplifies anxiety, if nobody communicates, the customer fills the silence with self-doubt. The opportunity is actively reinforcing the purchase decision. Tactics: a case study from a similar customer with a personal note, a "keep the faith" video reaffirming the benefits that motivated the purchase, a senior-management call, or an unexpected free upgrade, small on the P&L, large in perceived value.
3Activate (First delivery or first use)
The first real impression, customers read every detail of the packaging and materials here more closely than in any future interaction. The opportunity is setting the standard for every interaction that follows. Tactics: a personalized video from team members, a printed process map and success checklist for services, exceptional packaging for products, a follow-up call on delivery day, and an email addressing the customer's emotional state with clear, concise instructions for early success.
4Acclimate (Learning the system)
The customer learns to use the product and interacts with the team and additional offerings. The goal is early buy-in and habit formation before the novelty wears off. Tactics: shifting mail from "sales mode" to "success tools mode," quick individual surveys to segment and catch early attrition signals, group coaching calls that build accountability, and a milestone video from a senior team member showing personal investment in the customer's success.
5Accomplish (First result achieved)
The customer hits the outcome they originally bought for, closing the loop between promise and delivery. The opportunity is celebrating the milestone and reminding them the brand made it possible. Tactics: a physical celebration, a handwritten congratulatory note, a certificate or badge, a congratulatory call that acknowledges the ups and downs along the way, and a team congratulatory video that ties the customer's success to the company's mission.
6Adopt (Full integration into the brand)
The customer embraces the brand's philosophy and practice, habits are formed, results are more meaningful, and improvements show up in unexpected areas. Coleman notes most companies stall out just short of this point. The opportunity is formalizing a long-term relationship, turning the customer into an indispensable partner rather than an occasional buyer. Tactics: expert-user guides and advanced tips, a deep success survey for future personalization, a milestone-anniversary video from the whole team, and a personal call from a senior executive discussing the customer's specific achievements.
7Advocate (Past day 100: evangelist)
Customers can refer at any time, but day 100 is the natural moment to ask formally: testimonials are more credible, results are more quantifiable, and trust is well-established. The opportunity is deepening the existing bond while using the customer's success to attract new prospects. Tactics: inviting key customers to sales calls and events, a "100-day progress survey" that formally closes the period, a referral campaign to the most satisfied customers, requesting video testimonials, and a call from the CEO purely to celebrate the milestone, with no sales agenda.
Mental Models
| Concept | Description |
|---|---|
| First 100 Days | The critical window where a customer is won or lost for good, and the period most companies ignore entirely |
| Buyer's Remorse Gap | The "quiet zone" between purchase and delivery that the company must actively fill, or the customer fills it with doubt |
| Dopamine Drop | The natural decay of the purchase-moment high; the company's job is cushioning that drop with Affirm-phase touchpoints |
| 6 Channels × 8 Phases | A 48-cell matrix of contact opportunities; every company should have at least one touchpoint per phase |
| Present ≠ Branded Merch | A logoed mug or t-shirt is a gift for the company, not the customer. A real gift carries real perceived value |
| Advocacy timing | Don't ask for referrals before phase 7, the testimonial is worth more once there are 100 real days of experience behind it |
Quotable Lines
"The 'quiet zone' between the purchase and the delivery of your product/service further exacerbates the problem as the void in communication is filled by the customer's self-doubt."
"A chemical reaction in the brain affirms their choice with a dopamine release, producing an energy high that may or may not be perceptible to the customer."
"While many businesses stall out just before reaching this phase [Adopt]…"
"By the time the customer reaches [Advocate], testimonials are more meaningful and the results are more easily quantified and qualified."
Quick-Use Summary
The idea in one sentence: retention isn't an accident, it's a design problem, and the first 100 days after a sale are where most customers are actually won or lost, long before renewal ever comes up.
The three most applicable concepts:
- The 8 phases (Assess → Advocate) as a map of the customer's emotional state, not just their behavior.
- The Buyer's Remorse Gap, the quiet zone right after purchase that has to be filled deliberately or it fills itself with doubt.
- Advocacy timing, referrals asked for after day 100 are more credible and more effective than referrals asked for too early.