DHM Model (Delight, Hard to Copy, Margin)

Product strategy is about delighting customers in hard to copy, margin enhancing ways

Gibson Biddle
The art of product strategy and prioritization

DHM Model (Delight, Hard to Copy, Margin)

"The job is to delight customers in hard to copy, margin enhancing ways." - Gibson Biddle

What It Is

The DHM Model is a product strategy framework that provides a simple lens for evaluating any product decision or hypothesis. Developed and refined during Gibson Biddle's time at Netflix, the model argues that sustainable product strategy must satisfy three criteria simultaneously:

  1. Delight: Does this make customers genuinely happy? Not just satisfied, but delighted—10X better than alternatives.
  2. Hard to Copy: Will this create lasting competitive advantage? Or can competitors replicate it within a week?
  3. Margin Enhancing: Does this build a better business? Either through increased revenue, improved retention, or reduced costs.

The framework originated from Reed Hastings at Netflix. When Hastings did a reference check on Biddle before hiring him, the only question he asked was: "Is Gib ready? Can Gib delight customers?" This emphasis on delight—not just satisfaction—became foundational to Netflix's product philosophy.

How It Works

When evaluating any product strategy, feature, or hypothesis, score it against all three dimensions:

Delight Assessment:

  • Will customers love this, not just tolerate it?
  • Is this 10X better than what exists today?
  • At Netflix, delight was measured by retention improvement

Hard to Copy Assessment:

  • Can competitors replicate this quickly?
  • Does it build network effects, unique data, or brand trust?
  • Netflix's hard-to-copy advantages: personalization (taste profiles of 1B+ people), original content, brand trust

Margin Enhancement Assessment:

  • Does this improve the business economics?
  • For Netflix: Does it improve retention (reducing churn from 4.5% to 4.4% monthly)?
  • Does it help right-size investments (knowing 100M will watch Stranger Things vs 20M for BoJack)?

The Perfect New Release Test Example

Netflix customers consistently said they wanted new release DVDs faster. Netflix ran an A/B test:

  • Test cell: 10,000 customers got new releases the next day
  • Control: Customers got releases whenever (average 2 weeks)

Results:

  • Retention improved from 4.5% to 4.45% monthly churn
  • This saved ~5,000 customers × $100 LTV × 2 (word of mouth) = $1M value
  • But cost was $5M additional inventory

DHM Analysis:

  • Delight: Small (only 0.05% retention improvement)
  • Hard to Copy: No (Blockbuster could add inventory too)
  • Margin: Negative ($5M cost > $1M benefit)

Decision: Don't roll out. The hypothesis failed.

The Two-Percenter Rule

A related principle: kill features used by only 2% of customers. These "two percenters" create complexity that:

  • Confuses the 98% who don't use them
  • Gets forgotten during major updates (Netflix forgot about profiles when launching streaming)
  • Doesn't move the needle on delight or margin

How to Apply It

  1. Frame strategies as hypotheses: "We believe [feature] will delight customers because [reason], build hard-to-copy advantage through [mechanism], and improve margin by [metric]"

  2. Test each dimension separately:

    • A/B test for delight (measure retention, engagement, NPS)
    • Competitive analysis for hard-to-copy (how quickly can rivals replicate?)
    • Financial modeling for margin (what's the cost vs. value created?)

  3. Accept that most hypotheses fail: Expect 6 out of 10 product strategies to fail. The value comes from the 3-4 that work.

  4. Balance delight vs. margin carefully: If Netflix charged $5/month instead of $20, customers would be delighted but the business wouldn't work. Use experiments to find the equilibrium.

  5. Identify your hard-to-copy advantages: For Netflix—personalization data, original content, brand trust, network effects (every screen pre-wired for Netflix). Ask: What makes YOUR product hard to copy?

When to Use It

  • Strategic planning: Evaluate potential product strategies against all three dimensions
  • Feature prioritization: Score feature ideas on D, H, and M to guide roadmap decisions
  • Go/no-go decisions: Use as a checkpoint before major investments
  • Post-mortem analysis: Understand why initiatives succeeded or failed
  • Competitive analysis: Identify what makes your product defensible

When NOT to Use It

  • Very early stage when you're still searching for product-market fit (focus on delight first)
  • When facing existential threats that require short-term action
  • For purely operational decisions with no strategic implications

Source

  • Guest: Gibson Biddle
  • Episode: "The art of product strategy and prioritization"
  • Key Discussion: (03:27-18:10) - Introduction and explanation of DHM framework with Netflix examples
  • YouTube: Watch on YouTube

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