Improve Retention

Behavior Design Framework

Framework for designing products that reliably change behavior. Behavior is not about willpower or motivation — it is a design problem with a predictable equation.

Core Principle

The Fogg Behavior Model = B=MAP. Behavior happens when Motivation, Ability, and a Prompt converge at the same moment.

            HIGH ┃
                 ┃   ★ Behavior happens
                 ┃  (above the Action Line)
                 ┃
  Motivation     ┃━━━━━━━━━━━━━━━━━━━━━━━ ← Action Line
                 ┃
                 ┃   ✗ Behavior fails
                 ┃  (below the Action Line)
            LOW  ┃
                 ┗━━━━━━━━━━━━━━━━━━━━━━━━━
                 HARD                    EASY
                        Ability

The Action Line: When motivation and ability are sufficient, a prompt causes the behavior; below the line, no prompt works. High motivation compensates for low ability and vice versa. The reliable strategy is making behaviors easier (move right), not pumping up motivation (move up).

See: references/behavior-model.md when you need the curve mechanics behind this model — the full Action Line math, behavior types (dot/span/path), and a step-by-step failure diagnostic for a behavior that isn't happening.

Scoring

Goal: 10/10. The six Quick Diagnostic rows are the single source of score-movers. Rate each pass/fail, then start at 10 and subtract per failing row: low motivation or below the Action Line (rows 1-2) cost -2 each; prompts, celebration, bottleneck, and scaling (rows 3-6) cost -1.5 each. A design that passes all six scores 10; one that fails every row scores 0. Map to bands: 9-10 = behavior reliably crosses the Action Line at low motivation, prompts are event/anchor-tied, key actions are celebrated; 5-6 = depends on a motivation spike or optimizes a non-bottleneck factor; <=3 = core action below the Action Line, prompts are spam, no habit wiring. Always state the score and name the specific failing rows.

The Three Elements

1. Motivation

Core concept: Motivation is the energy for action, driven by three core motivators, each with two sides: Sensation (pleasure/pain), Anticipation (hope/fear), Belonging (acceptance/rejection). It is powerful but unreliable.

Why it works: Motivation comes in waves — it spikes (New Year's resolutions, product launches) and crashes (day 3, week 2). Products that depend on high motivation fail when the wave recedes; the best designs work at the trough.

Key insights:

• "Motivation is unreliable. Ability is not." — BJ Fogg
• Design for low-motivation moments, not peak excitement
• Motivation-first tactics (inspiring videos, aspirational messaging) produce spikes, not sustained behavior
• Match required motivation to behavior difficulty — hard behaviors need high motivation

Product applications:

Copy patterns:

• "Takes 30 seconds" (signals ease, lowers motivation needed)
• "Join 50,000 teams who..." (belonging motivator)
• "Don't lose your 7-day streak" (anticipation/fear motivator)

Ethical boundary: A fear motivator (the streak pattern above) is fair only when the loss is real and user-owned (their data, their progress); never invent a loss that exists solely to drive a session.

See: references/motivation-waves.md for the three motivators, motivation waves, and designing for troughs.

2. Ability

Core concept: Ability is the capacity to do the behavior — a function of the scarcest resource across six factors (the Ability Chain). If any single link is too weak, the behavior breaks.

Why it works: Unlike motivation, ability can be systematically engineered: every removed field, eliminated step, and preset default moves the behavior right on the model, crossing the Action Line even at low motivation. The Ability Chain gives you the diagnostic — find the weakest link and fix it.

Key insights:

• Six factors: Time, Money, Physical Effort, Mental Effort, Social Deviance, Non-Routine
• Simplicity is a function of the scarcest resource — find the bottleneck, not the most obvious factor
• "Simplicity changes behavior" — BJ Fogg
• Starter Steps: shrink the behavior to the tiniest version (2 minutes → 30 seconds → one field)
• Defaults are the most powerful ability tool — users rarely change them

Product applications:

Copy patterns:

• "One click to get started" (time + physical effort)
• "No technical skills needed" (mental effort)
• "Works just like tools you already use" (non-routine)

Ethical boundary: Reduce friction only on genuinely valuable behaviors — never make it too easy to overspend, over-share, or delete important data without confirmation.

See: references/ability-chain.md for the six factors in detail, friction audit templates, and simplification strategies.

3. Prompt

Core concept: The prompt says "do it now." Without one, behavior doesn't happen regardless of motivation and ability. Three types: Person Prompts (internal reminders), Context Prompts (environmental cues), Action Prompts (designed triggers from the product).

Why it works: Teams assume motivation + ability is enough — it isn't, not without a well-timed prompt. But prompts only work above the Action Line: a push notification to someone lacking motivation or ability is spam.

Key insights:

• A prompt at the wrong moment is noise; at the right moment, magic
• Anchor moments tie new behaviors to existing routines ("After I open Slack, I will...")
• Prompt fatigue is real — every unnecessary prompt degrades the value of future ones

Product applications:

Copy patterns:

• "Your weekly report is ready" (context prompt — real event)
• "One thing left to complete your setup" (action prompt with progress)
• Never: "We miss you!" (product need, not user need)

Ethical boundary: Every prompt must pass the test "Would I appreciate receiving this right now?" — if it serves a product metric (DAU, re-engagement) but not the user's current goal, cut it.

See: references/prompt-design.md for prompt types, timing strategies, notification design, and anchor moments.

Tiny Habits Method

The practical application of B=MAP: make behaviors so small they need almost no motivation, anchor them to existing routines, and celebrate immediately.

The Recipe

After I [ANCHOR MOMENT], I will [TINY BEHAVIOR], then I [CELEBRATION].

• Anchor Moment: an existing routine that reliably happens (opening an app, finishing a meeting, morning coffee).
• Tiny Behavior: the smallest version of the target behavior — not "write a report" but "open the report template."
• Celebration: an immediate positive emotion that wires the habit. Repetition alone isn't enough — you need the feeling of success.

Starter Steps

Every target behavior has a Starter Step — the tiniest meaningful version: