Use the four-part structure for maximum impact

Write what they did, how it changed you, what your life looks like now because of it, and how you carry it forward.

Why it works

The four-part structure forces elaborative encoding — the cognitive process of connecting a received benefit to its downstream consequences in your life. Superficial gratitude ("thanks for being there") produces brief positive affect; elaborative gratitude that traces a causal chain activates autobiographical memory more deeply, produces stronger emotional registration, and creates a more durable shift in attention toward received benefits.

How to do it

1. Part 1 (What): Name the specific action or choice the person made. One to two sentences, concrete and dated if possible.
2. Part 2 (Impact): Describe how that action changed your trajectory, perspective, or capability.
3. Part 3 (Now): Describe how your life now reflects that impact — what you can do, who you became, what you value.
4. Part 4 (Carry): Name what you are carrying forward because of them — the value, skill, or habit they gave you.

Evidence

Elaborative processing of positive events is associated with stronger emotional registration and better memory consolidation; the four-part structure operationalizes this for gratitude expression. The gratitude visit research confirms that detailed, specific letters produce larger effects than vague appreciation. (mechanistic)

The four-part structure is a practitioner framework distilled from the evidence; no study has compared this specific structure against alternatives within a controlled design.

Sources

• Seligman et al. (2005), positive psychology progress, American Psychologist

Common mistake

Writing Part 2 (impact) as "it made me feel good" — the mechanism requires specificity about how your life changed, not just that you felt grateful.