STP: Segmentation, Targeting, Positioning

Overview

STP is the foundational marketing strategy framework: divide the market into segments (S), select which to serve (T), and define how to win in chosen segments (P). It must be done in sequence — you cannot position without first choosing a target, and you cannot target without first segmenting.

When to Use

Trigger conditions:

User launching a new product and needs to define the target audience
User asks "who is our customer?" or "which segment should we focus on?"
User wants to craft a positioning statement or differentiation strategy
User's marketing feels unfocused — "we're trying to be everything to everyone"

When NOT to use:

For competitive industry analysis → use Porter's Five Forces
For growth path decisions → use Ansoff Matrix
For internal capability assessment → use SWOT

Framework

IRON LAW: Sequential Execution — S Before T Before P

Segmentation FIRST, then Targeting, then Positioning. In that order.
Choosing a target without segmenting first means you're guessing.
Positioning without a clear target means you're positioning for everyone
(which means no one).

IRON LAW: Segments Must Be MAMS

Every segment must satisfy all four criteria:
- Measurable: You can estimate the segment's size and purchasing power
- Accessible: You can reach the segment through available channels
- Material: The segment is large enough to be profitable
- Substantial: The segment is distinct enough to respond differently to
  different marketing mixes

A "segment" that fails any criterion is not actionable.

Step 1: Segmentation — Divide the Market

Use one or more segmentation bases:

Base	Variables	Example
Demographic	Age, gender, income, education, occupation, family size	"25-35 year old urban professionals earning >NT$60K/month"
Geographic	Country, city, climate, urban/rural, region	"Northern Taiwan metropolitan areas"
Psychographic	Lifestyle, values, personality, interests	"Health-conscious, willing to pay premium for organic"
Behavioral	Usage rate, loyalty, benefits sought, purchase occasion	"Heavy users who buy weekly, price-insensitive, value convenience"

Combine bases for sharper segments (e.g., demographic + behavioral).

Produce 3-6 distinct segments. Fewer than 3 means you haven't segmented; more than 6 is too fragmented to act on.

Step 2: Targeting — Select Your Segments

Evaluate each segment on:

Criterion	Question
Size & Growth	How large is the segment? Is it growing?
Profitability	What margins can you achieve in this segment?
Competition	How many competitors serve this segment? How strong?
Fit	Does this segment align with your capabilities and brand?
Accessibility	Can you reach this segment cost-effectively?

Choose a targeting strategy:

Concentrated: Focus on one segment (highest risk, highest specialization)
Differentiated: Target 2-3 segments with tailored offers (moderate risk)
Undifferentiated: Same offer to all (rarely recommended — defeats the purpose of STP)

Step 3: Positioning — Define Your Place in the Customer's Mind

Craft a positioning statement using this template:

For [target segment],
[brand/product] is the [category]
that [key benefit/differentiator]
because [reason to believe].

Then validate positioning against three tests:

Relevance: Does the target segment care about this benefit?
Differentiation: Can competitors claim the same thing?
Credibility: Can you deliver on this promise?

Step 4: Perceptual Map (Optional)

Plot brands on a 2D map using the two most important attributes for the target segment. This visualizes competitive positioning and identifies gaps.

Output Format

# STP Analysis: {Product/Brand}

## Segmentation

| Segment | Profile | Size | Growth | Key Need |
|---------|---------|------|--------|----------|
| Seg A | {description} | {$X / N people} | {X%} | {primary need} |
| Seg B | ... | ... | ... | ... |
| Seg C | ... | ... | ... | ... |

## Targeting

| Segment | Size | Profitability | Competition | Fit | Score |
|---------|------|-------------|-------------|-----|-------|
| Seg A | H/M/L | H/M/L | H/M/L | H/M/L | {total} |

**Selected target(s):** {segment(s)} — {rationale}
**Targeting strategy:** Concentrated / Differentiated

## Positioning

**Statement:**
For {target segment}, {brand} is the {category} that {benefit} because {reason to believe}.

**Validation:**
- Relevance: ✓/✗ — {evidence}
- Differentiation: ✓/✗ — {evidence}
- Credibility: ✓/✗ — {evidence}

Examples

Correct Application

Scenario: STP for a new plant-based protein bar in Taiwan

Segmentation (Behavioral + Demographic):

Segment	Profile	Size	Key Need
Fitness Enthusiasts	20-35, gym-goers, track macros	~800K in Taiwan	High protein, clean label
Health-Conscious Office Workers	25-45, desk jobs, skip meals	~1.5M	Convenient meal replacement, low sugar
Vegan/Vegetarian Consumers	All ages, ethical/dietary choice	~300K	Plant-based, no animal derivatives

Targeting: Health-Conscious Office Workers — largest segment, underserved (most protein bars target gym-goers), high accessibility via convenience stores.

Positioning: "For busy professionals who skip meals, PlantBar is the plant-based protein bar that replaces a meal in 60 seconds because each bar has 20g protein, 5g fiber, and all essential vitamins — made entirely from whole food ingredients."

Incorrect Application

What went wrong:

Positioning statement: "For everyone who likes healthy food" → Not a segment. "Everyone" fails the MAMS test (not Measurable, not Substantial as a distinct group). Violates Iron Law.
Jumped straight to positioning ("we're the premium option") without segmenting or targeting → Violates Iron Law: S before T before P.

Gotchas

Over-segmentation: Creating 10+ micro-segments that are too small to serve profitably. Each segment must pass the MAMS test, especially "Material" (large enough).
Demographic-only segmentation: Demographics describe who, not why they buy. Always combine with behavioral or psychographic bases for actionable segments.
Positioning on features, not benefits: "We have 20g protein" is a feature. "Replaces a meal in 60 seconds" is a benefit. Customers buy benefits.
Positioning that's not differentiated: "High quality at a fair price" describes every brand. If your competitor can make the same claim, it's not positioning.
Ignoring the perceptual map: Where customers THINK you are matters more than where you WANT to be. Validate positioning with customer research when possible.

References

For perceptual mapping techniques, see references/perceptual-mapping.md
For comparison with other marketing frameworks, see references/framework-comparison.md

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