00 What this study set out to learn
Prospective divers — people who have not yet tried scuba — were asked to sort 39 PADI content cards into groups of their own making and name each group. The question behind it: how do future divers expect this content to be organised?
People agree on a journey, not a product list
The sorts organise PADI's content around intent ("what do I want to do?") rather than PADI's internal product or business taxonomy. The recurring shape is a journey: learn → choose how & where to dive → join a community → care for the ocean.The study was run twice — once in English, once in Spanish, with different audiences — and the same seven groups emerged in both. Because every structural measure here reads only which cards were grouped together (never the translated labels), the two studies compare cleanly and act as independent confirmation of each other.
01 At a glance
How the two samples and their overall structure line up. The two studies were run independently, in different languages, with different audiences.
| Measure | English (EN) | Spanish (ES) |
|---|---|---|
| Participants recruited | 35 | 25 |
| Valid sorts | 31 | 19 |
| Excluded (rate) | 4 (11%) | 6 (24%) |
| Mean groups / participant | 5.2 | 5.3 |
| Standardised categories | 13 | 15 |
| Cards sorted | 39 | 39 |
| Emergent clusters | 7 | 7 |
| Cophenetic r | 0.828 | 0.863 |
A reliable, consistent structure
Both studies produced the same seven clusters with comparable cohesion and well-matched effort (5.2 vs 5.3 groups per participant). The cophenetic r of 0.83 (EN) / 0.86 (ES) — both comfortably above the ~0.75 reliability threshold — confirms the cluster tree faithfully represents the underlying agreements.02 Who sorted the cards
Combined profile of the 50 valid participants across both studies — the people whose sorts feed every number in this report.
Profiles per study
The valid English (31) and Spanish (19) samples, side by side. Blue = English, orange = Spanish.
Source: recruitment screener & panel demographics embedded in each response file (column "Demographics").
03 Category mapping
An open card sort lets people name their own groups, so the raw labels vary wildly. Every label was standardised into a consistent set of themes — 13 in English, 15 in Spanish. This is the one step that depends on wording, so it is published in full: each theme lists the exact labels participants typed and how many used each. Switch between studies.
04 How the numbers are built
An open card sort: each participant sorted the same 39 cards into as many groups as they liked and named each group. Everything below is computed from those raw groupings.
The pipeline, end to end
- Co-occurrence (similarity) matrix — for all 741 card pairs, the share of participants who placed both cards in the same group. This reads only which cards were grouped, so it is language-independent.
- Hierarchical clustering — average-linkage agglomerative clustering on a distance of (1 − co-occurrence). Average linkage suits card-sort distances (which are not Euclidean). The tree was cut into 7 clusters.
- Cophenetic correlation — how faithfully the tree preserves the original pairwise distances: 0.828 (EN) and 0.863 (ES).
- Cohesion — a cluster's mean within-cluster co-occurrence; how tightly its cards travel together.
- Dominant placement — the only label-dependent measure: each participant's group names were standardised into 13 (EN) / 15 (ES) themes, and a card's "placed %" is the share of participants who filed it under its single most-common theme.
Note: the Spanish study's card names were mapped one-to-one to the canonical English card IDs (39/39 cards) purely so the two studies share a vocabulary — the grouping data is untouched. The clustering, similarity and pairing measures depend only on which cards were grouped together, never the labels, so they compare cleanly across languages.
See it both ways
The two views the pipeline produces — the co-occurrence matrix and the clustering tree — shown for each study. Colours mark the seven clusters used throughout this report.
05 The seven emergent clusters
The same seven mental models surfaced in both languages. Cohesion bars show how tightly each cluster's cards were grouped — English and Spanish computed independently on the shared card membership.
Learn / Get Started Prominent cluster
Everything about taking the first step — why to dive, how to start, the basics and certification.
Travel & Where to Dive Prominent cluster
Choosing where to go and how to get there — sites, shops, resorts, regions and trip planning.
The Diving Club Significantly strong
A small, crisp pair — joining and understanding the community. The most tightly-agreed group of all.
Ways to Dive Net-new group
The different forms of diving and water activity — snorkeling, freediving, family and fun dives.
Wellbeing & Why Dive Net-new group
The emotional pull — calm, connection to the ocean, the wonder of the underwater world.
About & Brand Significantly strong
Who PADI is and what it stands for — mission, history, what makes it different, blogs and events.
Environment & Conservation Significantly strong
Caring for the ocean — the AWARE program, beginner conservation activities, the plastics petition.
Cluster by cluster
For each cluster: the cards it contains with their dominant-placement % and strongest grouping partner, beside the EN/ES cohesion.
Learn / Get Started
Prominent cluster| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Learn to Scuba Dive | 58% | Learn to Dive | Scuba Basics Guide 87% |
| Discover Scuba Diving | 55% | Learn to Dive | Learn to Scuba Dive 84% |
| Scuba Basics Guide | 55% | Learn to Dive | Learn to Scuba Dive 87% |
| Why Dive? | 52% | Learn to Dive | Discover Scuba Diving 71% |
| Youth Scuba Diving | 42% | Learn to Dive | Discover Scuba Diving 61% |
| Certification Levels Explained | 39% | Learn to Dive | Scuba Basics Guide 68% |
| Common misconceptions about diving | 32% | Learn to Dive | Certification Levels Explained 64% |
| Dive Guides | 29% | Travel & Destinations | Dive Travel Guides 64% |
| Why Dive Responsibly? | 23% | Learn to Dive | Common misconceptions about diving 52% |
Everything about taking the first step — why to dive, how to start, the basics and certification.
Travel & Where to Dive
Prominent cluster| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Travel Destinations for Beginners | 55% | Travel & Destinations | Travel Inspiration 84% |
| Travel Inspiration | 55% | Travel & Destinations | Travel Destinations for Beginners 84% |
| Dive Resorts | 48% | Travel & Destinations | Dive Sites Nearby 71% |
| Explore Guides by Region | 48% | Travel & Destinations | Dive Travel Guides 74% |
| Travel Planning Tips | 48% | Travel & Destinations | Travel Destinations for Beginners 74% |
| Adventures | 42% | Travel & Destinations | Travel Inspiration 61% |
| Dive Travel Guides | 42% | Travel & Destinations | Explore Guides by Region 74% |
| Dive Sites Nearby | 35% | Travel & Destinations | Dive Shop Locator 77% |
| Dive Shop Locator | 32% | Travel & Destinations | Dive Sites Nearby 77% |
| Gift Guide | 29% | Travel & Destinations | Explore Guides by Region 52% |
| Find a Dive Shop | 26% | Travel & Destinations | Dive Shop Locator 77% |
| Liveaboards | 26% | Travel & Destinations | Travel Planning Tips 45% |
Choosing where to go and how to get there — sites, shops, resorts, regions and trip planning.
The Diving Club
Significantly strong| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Join Diving Club | 32% | Club & Community | What is the Diving Club? 55% |
| What is the Diving Club? | 32% | Club & Community | Join Diving Club 55% |
A small, crisp pair — joining and understanding the community. The most tightly-agreed group of all.
Ways to Dive
Net-new group| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Freediving | 35% | Ways to Dive | Snorkeling 77% |
| Mermaid | 35% | Ways to Dive | Snorkeling 71% |
| Snorkeling | 35% | Ways to Dive | Freediving 77% |
| Open Water Diver | 26% | Ways to Dive | Freediving 52% |
| Family Diving | 23% | Learn to Dive | Youth Scuba Diving 48% |
| Fun Dives | 23% | Diving Basics | Dive Sites Nearby 48% |
The different forms of diving and water activity — snorkeling, freediving, family and fun dives.
Wellbeing & Why Dive
Net-new group| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Calming effects of Diving | 35% | Diving Basics | Common misconceptions about diving 58% |
| Discover the Underwater World | 29% | Learn to Dive | Connect with the Ocean 58% |
| Connect with the Ocean | 19% | Diving Basics | Discover the Underwater World 58% |
The emotional pull — calm, connection to the ocean, the wonder of the underwater world.
About & Brand
Significantly strong| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Our Mission & History | 39% | About & Brand | Our Difference 90% |
| Our Difference | 35% | About & Brand | Our Mission & History 90% |
| Community Events | 32% | Club & Community | Blogs & Stories 55% |
| Blogs & Stories | 29% | About & Brand | Community Events 55% |
Who PADI is and what it stands for — mission, history, what makes it different, blogs and events.
Environment & Conservation
Significantly strong| Card | Placed | Top theme | Strongest partner (co-occurrence) |
|---|---|---|---|
| Global Plastics Petition | 35% | Environment & Conservation | AWARE Program 68% |
| Conservation Activities for Beginners | 32% | Environment & Conservation | AWARE Program 68% |
| AWARE Program | 29% | Environment & Conservation | Conservation Activities for Beginners 68% |
Caring for the ocean — the AWARE program, beginner conservation activities, the plastics petition.
06 The pattern observed — run twice, same result
The study ran independently in two languages and produced the same seven groups with comparable cohesion — strong independent confirmation of the structure.
| Cluster | English cohesion (n=31) | Spanish cohesion (n=19) |
|---|---|---|
| Learn / Get Started | 51% | 40% |
| Travel & Where to Dive | 52% | 46% |
| The Diving Club | 55% | 79% |
| Ways to Dive | 46% | 52% |
| Wellbeing & Why Dive | 52% | 53% |
| About & Brand | 55% | 57% |
| Environment & Conservation | 66% | 58% |
The same skeleton, produced twice
The Diving Club is the most tightly-agreed group in both languages (55% EN / 79% ES) — a crisp two-card island people instinctively keep together. Environment & Conservation is also highly cohesive (66% / 58%) even though its individual cards are peripheral: participants know the content belongs together, but it isn't a primary destination. The looser clusters (Learn, Ways to Dive) are broad by nature — they hold many cards spanning several sub-themes.07 The strongest card pairs
The card pairs the most people grouped together — the load-bearing relationships to keep intact in any navigation. Shown for both studies.
| Card pair | English (n=31) | Spanish (n=19) |
|---|---|---|
| Learn to Scuba Dive + Scuba Basics Guide | 87% | 79% |
| Freediving + Snorkeling | 77% | 84% |
| Travel Destinations for Beginners + Travel Inspiration | 84% | 53% |
| Our Difference + Our Mission & History | 90% | 74% |
| Discover Scuba Diving + Learn to Scuba Dive | 84% | 74% |
The full top-10 strongest pairs
| Our Difference + Our Mission & History | 90% |
| Learn to Scuba Dive + Scuba Basics Guide | 87% |
| Discover Scuba Diving + Learn to Scuba Dive | 84% |
| Travel Destinations for Beginners + Travel Inspiration | 84% |
| Dive Shop Locator + Dive Sites Nearby | 77% |
| Dive Shop Locator + Find a Dive Shop | 77% |
| Freediving + Snorkeling | 77% |
| Dive Travel Guides + Explore Guides by Region | 74% |
| Explore Guides by Region + Travel Destinations for Beginners | 74% |
| Explore Guides by Region + Travel Inspiration | 74% |
| Dive Shop Locator + Find a Dive Shop | 95% |
| Freediving + Snorkeling | 84% |
| Calming effects of Diving + Common misconceptions about diving | 79% |
| Calming effects of Diving + Why Dive? | 79% |
| Common misconceptions about diving + Why Dive? | 79% |
| Dive Resorts + Travel Inspiration | 79% |
| Explore Guides by Region + Travel Planning Tips | 79% |
| Freediving + Mermaid | 79% |
| Join Diving Club + What is the Diving Club? | 79% |
| Learn to Scuba Dive + Scuba Basics Guide | 79% |
Percentages = share of valid participants who placed both cards in the same group. The two single strongest bonds — Our Difference + Our Mission & History (90% EN) and Learn to Scuba Dive + Scuba Basics Guide (87% EN) — anchor the About & Brand and Learn clusters respectively.
08 Ambiguous cards
The mirror image of the strongest pairs. These are the cards with the lowest average top-theme agreement across the English and Spanish studies — content participants scattered across many groups with no clear consensus on where it belongs. Each row reads how to interpret that ambiguity.
| Card | # categories it appeared in | Best placement | Strongest pair | Interpretation |
|---|---|---|---|---|
| Blogs & Stories | 8 | 29% into About & Brand | 55% with Community Events | Editorial content with no natural home — drifts between About & Brand, the community and travel. Its strongest tie is to Community Events, not the About cards, pointing to a stories / community hub rather than a brand page. |
| Why Dive Responsibly? | 10 | 23% into Learn to Dive | 52% with Common misconceptions about diving | Straddles Learning, Conservation and the emotional 'why dive' cards. People read it most as beginner education (it bonds with Common misconceptions), so it lands in Learn far more often than in Environment. |
| Connect with the Ocean | 10 | 19% into Diving Basics | 58% with Discover the Underwater World | The most scattered card in the study — an emotional theme with no obvious bucket. Its one real anchor is Discover the Underwater World, so it belongs with the Wellbeing / 'why dive' cluster, not on its own. |
| Dive Guides | 9 | 29% into Travel & Destinations | 64% with Dive Travel Guides | An ambiguous label: 'guides' reads as both travel guides and how-to learning content. It co-occurs most with Dive Travel Guides, tipping it toward Travel — but the label needs sharpening to settle it. |
| Find a Dive Shop | 10 | 29% into Travel & Destinations | 77% with Dive Shop Locator | Scattered across categories, yet nearly inseparable from Dive Shop Locator — the two are near-duplicates. The spread is about which section owns 'shops', not whether these belong together; keep them as a pair. |
| Gift Guide | 9 | 29% into Travel & Destinations | 52% with Explore Guides by Region | A commerce / gifting card with no natural place in a prospective diver's journey, so it lands wherever 'extras' go. Weak ties throughout — a candidate for a utility / shop area, or for cutting from the core IA. |
| Liveaboards | 10 | 29% into Travel & Destinations | 45% with Travel Planning Tips | A niche travel product unfamiliar to people who haven't dived yet, so it scatters. Its best (and still weak) tie is Travel Planning Tips — nominally Travel, but the low agreement reflects low recognition. |
| Calming effects of Diving | 9 | 35% into Diving Basics | 58% with Common misconceptions about diving | A Wellbeing / 'why dive' card that many filed under general diving basics instead. It bonds with the emotional cluster but overlaps heavily with intro content — group it with Wellbeing and expect leakage. |
| Community Events | 10 | 32% into Club & Community | 55% with Blogs & Stories | Floats between the Diving Club community and About / editorial content. Its strongest tie is Blogs & Stories rather than the Club cards, suggesting a content-and-community hub over a membership section. |
| What is the Diving Club? | 9 | 32% into Club & Community | 55% with Join Diving Club | Inseparable from Join Diving Club, but that pair sits apart from everything else, so people were unsure which top-level section owns it. Keep the two Club cards together as their own distinct area. |
"# categories" = how many distinct groups the card landed in (the wider the scatter, the more contested). "Best placement" = its single most-common theme and the share of participants who filed it there. "Strongest pair" = the highest co-occurrence the card has with any one other card — often the only firm relationship an otherwise-scattered card has. Ranked by the average of the English and Spanish best-placement scores, lowest first.
What to do with them
The contested cards cluster around three blurry edges. Editorial & utility content — Blogs & Stories, Gift Guide, Dive Guides, Find a Dive Shop — drifts between About, Travel and Shop. The "why dive" emotional cards — Why Dive Responsibly?, Connect with the Ocean, Calming effects of Diving — split between Wellbeing, Learn and Environment. And the community cards — What is the Diving Club?, Join Diving Club, Community Events — bond tightly to each other yet float between Community and About. For these, the navigation should make an opinionated call and the card labels should be sharpened: left alone, they will not place themselves.09 Data quality & exclusions
Before analysis, sorts that carried no usable signal were removed — incomplete submissions and non-thematic / nonsense labelling — leaving 4 excluded in English and 6 in Spanish.
- 3 — No sort submitted
- 1 — Low-effort / nonsense labels
- 5 — No sort submitted
- 1 — Binary Yes/No labels (not thematic)
The higher Spanish exclusion rate (24% vs 11%) is driven almost entirely by no sort submitted — a recruitment/completion artefact, not a sorting-quality problem. After cleaning, the two valid samples are well-matched in effort: a mean of 5.2 (EN) and 5.3 (ES) groups per participant.
10 What the data tells us & next steps
The signal is strong, bilingual, and consistent. Four things to carry forward.
Build navigation around the journey
Learn → Ways to Dive → Travel & Where to Dive → Community → Wellbeing → Environment is a real, consistent structure — organise around intent, not the internal product catalogue.
Keep the load-bearing pairs together
The 80–90% pairs (the Learn core, the Travel family, the About pair, Freediving+Snorkeling) are the relationships users will expect to find side by side. Splitting them across sections will fight the mental model.
Trust the bilingual confirmation
Seven clusters, comparable cohesion, and a cophenetic r above 0.82 in both languages means the structure is not a quirk of one audience. The clearest divergence is a minor About ↔ Environment boundary shift between languages.
Compare, then commit to an IA
Compare these clusters against the Active and PRO-diver studies, then design the final opinionated information architecture backed by this data.
11 The raw sorts
Every valid participant's groups, exactly as they created and labelled them. Switch between the two studies — English groups are shown in English, Spanish groups in Spanish, as submitted.